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Whales

Heat Run: Humpback Whale Behavior Photos

Hawaii, Humpback Whale, Icons, Ocean Realm

Humpback whale underwater photography. Originally titled “Heat Run”, this appeared in Ocean Realm Magazine in April 1995, the first of a series of articles I authored for Ocean Realm in the ’90s.

This blog post is now available as a downloadable PDF article.

Each winter North Pacific humpback whales (Megaptera novaeangliae) converge on Hawaii to calve, form consort pairs and eventually mate. These social activities often culminate in “heat runs”, exciting and only partly understood spectacles of competition unique among cetaceans. It should be pointed out that the term heat run is colloquial suggesting the female whale involved is “in heat” (estrous). In fact there is little direct evidence that estrous is occurring in these events. But since the behaviors involved are thought to be related to courtship and mating, and since heat run continues to be widely used (and not just in Hawaii), I have chosen to leave it in this account. If I were to write this today, I would probably elect to use “competitive group”, “rowdy group” or “surface active group”.


“We’re out of gear.” The props have stopped spinning and humpback pod 1994-181 has surfaced, heading directly toward our research boat. Slipping into the water I immediately sense their presence. An immense deep thrumming sound sets my hair on end, as if I were inside a huge cathedral organ. The mother-calf-escort trio appears 80 feet away and the male escort is singing, a behavior typically observed only in solitary resting males. As the escort glides below, the mother and calf come directly toward me while I hang motionless 15 feet deep. I am awestruck, alone with three enormous humpback whales, all of us breathholding in deep blue water. The mother brings her calf near to examine me, undoubtedly the first human it has seen. I must lift my legs to allow the mother’s 12 foot long pectoral fin to pass underneath. Her calf’s body coloration is just emerging and it is without significant diving ability, staying just below the surface and hugging closely to its mother but on my side, an indication of the mother’s acceptance of me. This calf is so close I could touch it! I take a few photos, recording the whales eyeballing of me as they pass. In contrast to the infant whale’s awkward swimming motions, the mother lifts her fluke in an easy kick, an uncommon opportunity for a tight underwater fluke shot as they move by.

North Pacific humpback whales, a mother and calf pair swim closely together just under the surface of the ocean.  The calf will remain with its mother for about a year, migrating from Hawaii to Alaska to feed on herring, Megaptera novaeangliae, Maui

North Pacific humpback whales, a mother and calf pair swim closely together just under the surface of the ocean. The calf will remain with its mother for about a year, migrating from Hawaii to Alaska to feed on herring.
Image ID: 00140
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Before losing interest and swimming off, pod 181 offered us four more close passes, enough to capture scientifically valuable video images and identifying photographs. In terms of information, this pod provided an ideal encounter. Photographs revealed the mother was previously seen in 1993 in the company of several identified males, one of which could be the father of this calf. This represents a rare potential escort-mother-calf link, a connection important to the study of the long-term social affiliation characteristics of humpback whales. In addition, the male currently escorting the mother in pod 181 may sire her next calf. Beyond the social affiliation implications, pod 181 also symbolized the assumed culmination of a winter social activity among humpbacks known in Hawaii as the heat run, a beautiful, violent and unique phenomenon believed instrumental in determining courtship and mating associations and ultimately resulting one year later in that most characteristic and endearing humpback group, the mother and calf.

Molokai and water pools, viewed from west Maui

Molokai and water pools, viewed from west Maui.
Image ID: 00253
Location: Maui, Hawaii, USA

Once a single land mass of four volcanoes, the islands of Maui, Molokai, Lanai and Kahoolawe now seem like an enormous hand sunken so only the palm and fingertips are visible. Wild and lonely Pacific waters swirl through these fingers and temporarily find calm in the wind lee of Maui, dominated by towering Haleakala volcano and the cloud-ringed West Maui mountains. In this lee, tucked tightly against the coast from Maalaea to Olowalu, humpback mothers regularly bring their new calves to swim in the shallow nearshore waters, to nurse and to gain strength for their coming journey to Alaska. Lanai also has a lee shore where, in addition to mothers and calves, subadult whales are often found socializing, singing and lamenting after being rudely “dropped off” by a mother who has gone to find this year’s mate. But away from shore, calm frequently gives way to weather as the trade winds funnel through the Pailolo channel and streak across Maui’s low-lying midlands into the four island basin, creating shifting windlines that can change glassy calm water into whitecapped swells within minutes. It is here, on the open water among volcanoes and clouds, wind and waves and blazing sun, that Dr. Dan Salden studies the Hawaiian humpback whale.

Humpback whales at the surface, volcano and clouds, Megaptera novaeangliae, Maui

Humpback whales at the surface, volcano and clouds.
Image ID: 00425
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Dr. Dan R. Salden steers our small zodiac towards a large pod of surface active whales, at least twelve in number, swimming quickly across the Auau channel. From the strength and frequency of the whales’ distant blows we had earlier determined, while still several miles away, that the animals were exerting themselves tremendously. Positioning the boat alongside and slightly behind the pod, we match speeds with them and begin observing their behavior. Over the past thirty-one years Dr. Salden has mastered the art of approaching humpbacks without disturbing them. When the lead whale blows and makes a shallow dive the rest of the pod follows. Underwater the whales slow, turn and move directly below us. As they return to the surface we find ourselves amid the pod with whales beside, ahead and underneath the boat. Two whales glide just yards below the keel, each almost twice as long as our skiff. One has ghostly white pectoral fins spanning 30 feet tip to tip. The whales are clearly aware of our proximity and make no overtures toward us, exhibiting exceptional body control as they repeatedly pass within feet of the hull while working amongst themselves to establish position. As whales surface to breathe and dive again, we situate ourselves to photograph identifying markings and scars found on the underside and trailing edge of their flukes. These photographs will be matched against the Hawaii Whale Research Foundation’s (HWRF) database of “fluke IDs” in order to establish individual histories and verify repeat sightings. Dan is now truly in his element, photographing new flukes and pleased to recognize animals from past encounters. Their sequential blows are heard over the boat engines, massive exhalations of breath mixed with atomized water and carrying a thick fishy smell. Dan points out the pod’s two focal animals immediately in front of us — the female seems to be dictating the direction of the pod’s travel while flanking her closely is the escort, a whale whose bloody head nodules and scarred, raw dorsal ridge attest to recent violent encounters.

Suddenly a challenging male rushes in from the side, lunging forward and out of the water, its head completely aloft. Crashing its chin down upon the back of the escort, this new whale tries to displace the escort. The challenge has been made, and a “heat run” has begun. Within seconds, the escort parries the challenger’s head lunge with a peduncle throw, a behavior as exciting to observe as a full breach. Converting his forward momentum into a crack-the-whip rotation, the escort pivots about his submerged head, thrusting his entire fluke and peduncle (the muscular rear portion of his torso) out of the water and laterally at the challenger. An opening behind the female forms as the fighting males move away from the rest of the pod. Before a lesser challenger can fill the gap, the female slows and waits for the escort to rejoin her. Whales begin trumpeting loudly as they surface to breathe, a series of rolling “harumph-umph-umph” sounds that may be attempts at intimidation or simply the result of strenuous exertion. Additional challengers draw in tightly behind the escort, determining among themselves who gets to make a new challenge when the current conflict is resolved. The escort repeatedly blocks the primary challenger, actually pushing him sideways across the surface, then quickly resumes his position beside and behind the female to await his adversary’s next move. Giving up after several failed attempts to displace the escort, the primary challenger breaks off from the pod and departs. Another whale in the pod, who has perhaps been waiting “its turn”, takes his place and the battle continues.

North Pacific humpback whale, escort in competitive group makes fast close pass, Megaptera novaeangliae, Maui

North Pacific humpback whale, escort in competitive group makes fast close pass.
Image ID: 06057
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

The “heat run” is a setting for spectacular acrobatics and provides an opportunity to study the humpback courtship process. The focus of the run is usually an adult female although there are all-male surface active groups. Typically she is without calf and swimming at speed so that the males pursue quickly, close to the surface. As the season progresses and calves appear more frequently, we encounter runs in which the pace is slowed by a mother with her calf. (In 1993 we observed a surface active group that formed around a sleeping mother / calf pair.) Today, the female is without a calf and has allowed an adult male to accompany her. This escort flanks her continually hoping ultimately to mate with her, wary of others who wish to usurp his position. Staying ahead of the female and escort and careful to keep out of the fray are three subadult whales just a few years old, not challenging the escort but instead apparently just observing the adult’s behavior in anticipation of their own future roles one day.

Humpback whale dorsal fin damaged during competitive group socializing, Megaptera novaeangliae, Maui

Humpback whale dorsal fin damaged during competitive group socializing.
Image ID: 04334
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

The escort’s principal concern is a lineup of challenging males spread out behind him. Each challenger may attempt to displace him from his position with the female. Challenges are an escalating series of maneuvers that may stop at intimidation or culminate in physical injury. On rare occasions Dr. Salden has observed cooperation among challengers, teaming up to defeat the escort. Lesser challengers often engage in side skirmishes among themselves away from the pod, perhaps to establish a pecking order. A successful challenger may become the new escort if the female is accepting and if he can resist further challenges. Determining the gender and roles of the female, escort and seasoned challengers in an active group is straightforward: unlike the smooth skin of females who do not battle, adult males who have accumulated the skill and strength to challenge are scarred and often display dorsal fins that are merely stumps, sheared off by a past opponent’s attack. The dorsal ridge (the backbone leading from the dorsal fin to the fluke) is usually carved with gouges, rips, and white scars, grim testaments to the effectiveness of a humpback whale’s barnacle-encrusted chin as a hammering weapon.

North Pacific humpback whale, adult male with bloody head nodules wounded from colliding with other escorts during competitive interactions, Megaptera novaeangliae, Maui

North Pacific humpback whale, adult male with bloody head nodules wounded from colliding with other escorts during competitive interactions.
Image ID: 02152
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Interpreting heat run events from a boat can be difficult, especially with a large pod. The role of animals not directly involved in the conflict is unclear, and the gender of younger whales cannot be determined from superficial scarring. The role of each challenger is fluid, with males jostling for optimal position relative to the female. Whales with white pectoral fins are the most distinguishable underwater, even when 50-80 feet deep. Some individuals have other distinguishing features, such as dorsal fins — hooked, pointed, stumped or gouged — that are visible whenever they break the surface. The rest are usually known only by their fluke patterns, any unusual scarring, or perhaps by their maintaining a constant position in the pod throughout the run.

Humpback whale fluking up, ventral aspect of fluke visible, Megaptera novaeangliae, Maui

Humpback whale fluking up, ventral aspect of fluke visible.
Image ID: 04150
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

When the whales have long down times we must enter the water with them to better witness how the skirmish is resolving itself. Allowed under HWRF’s research permit, underwater study offers opportunities to more fully assess the sex and social roles of key animals and to observe chance behaviors such as nursing and penile displays. (Although whales have internal genitalia, gender can be determined by observing the genital slit and surrounding features, located on the ventral peduncle anterior to the fluke.) Given a change in direction that results in the pod swimming toward the boat, Dan stops for us to enter before moving the boat out of the whales’ path. Only free diving equipment is used and special care is made to minimize water disturbance and to remain unobtrusive. Once the animals are in sight we swim parallel to them and do not dive below them unless they have already shown that they fully accept our presence in the water. For the fortunate few researchers allowed in the water these are often the most rewarding moments of our work, occasions to observe up to a dozen 40-ton whales at once, racing and jostling and flying by.

North Pacific humpback whales, socializing trio of adults, Megaptera novaeangliae, Maui

North Pacific humpback whales, socializing trio of adults.
Image ID: 05933
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Getting away from the departing boat’s prop wash is nerve-wracking — whales will be here in moments and I cannot see through the bubbles. Once into clear water I make out the female, leading the pod with four others some 50 feet behind her. Their sounds are a wild dissonance of low pitched calls quite different from the orderly singing of resting males. If they see me, as the female and two of the others do, the whales usually cruise by without changing their behavior. It is amazing to see them corkscrew in order to position both eyes for a stereoscopic view of me. The low contrast of grayish whale against blue water makes it difficult to see all the animals, especially some that pass behind or below. Battling whales that do not see me are a danger and I stay ready to move out of their path. The escort and primary challenger are now drawing near and are intent on one another, flukes pumping and heads driving furiously against each other. Diving, they leave a roiling footprint on the surface and pass within a body length of where I float. The escort has the advantage of bearing down on the challenger from above, pushing with his rostrum and using his pectoral fins to maintain position, while the challenger manages to twist and lash at the escort’s body with lateral fluke swipes. Although the combatants have not actively sought food since leaving Alaska in January, they are expending enormous amounts of energy. I feel insignificant in comparison. When they have faded from sight all that remains is a bubble trail that one whale left behind, a three hundred foot long contrail glistening in the sun, rising silently to the surface.

North Pacific humpback whale, male escort bubble streams alongside mother and calf, Megaptera novaeangliae, Maui

North Pacific humpback whale, male escort bubble streams alongside mother and calf.
Image ID: 05926
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Whales constantly enter and exit heat runs, some of which last an entire day. Distant animals may hear the activities and rush over to investigate. Defeated challengers and disinterested subadults often veer off and disaffiliate, perhaps later to breathhold (rest) or sing. On several occasions we observed two surface active pods cross paths. In the ensuing chaos whales shuffle between pods and wholesale changes in a pod’s temporal social hierarchy may occur.

In one sense, a breach is any behavior in which a substantial portion of the whale breaks the surface. But in practice, a breach is considered to be that most dramatic of events, when the whale launches itself headfirst out of the water with such force it becomes almost entirely airborne. Breaching associated with the heat run most often occurs when a humpback affiliates (joins the pod) or disaffiliates. In addition to the possibility that whales are visually scanning their environment while breaching, Dr. Salden feels the breach has a communication function as well, an opinion shared by other researchers and formulated from years of anecdotal observations. An expert in nonverbal communication, Dr. Salden suspects breaching is the humpback’s way of announcing It is I!, with any surrounding activities forming a context in which the breach must be interpreted. It may be an aggressive signal from an arriving whale (It is I, watch out!) or a parting shot from a disaffiliating whale (Remember me!). When accompanied by a breach, whatever the whale is communicating is “said” with emphasis. An adult whale’s full breach is the most exciting singular behavior humpback observers see. A mighty launch rockets 45 tons of twisting whale skyward, pectoral fins flinging sheets of water aside, ending in a slow motion body slam heard for great distances.

North Pacific humpback whale, breach, Megaptera novaeangliae, Maui

North Pacific humpback whale, breach.
Image ID: 00205
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Underwater, a full breach is a frightening thunderclap, a painfully sharp crack. Captain Jill Mickelsen and I experienced a particularly memorable breaching session one day while in the water observing a mother-calf-escort trio off the north shore of Lanai. Strangely, as the mother and calf slowly circled us, the escort unleashed a succession of more than 25 breaches quite close to our boat. Wind chop, combined with his splashes, reduced the water visibility to less than 60 feet, forcing Jill and I to search continually for the escort deep below as he prepared to rush upward for his next launch. Occasionally, we could see him spiraling and pumping as he approached the surface and we could signal to the boat where he would emerge. More often we would simply hear his breach and realize gratefully that he did not land on us. Researcher David Glickman was able to capture these breaches in a video record that shows the escort slamming one pectoral fin against the water each time he landed, as if to add to his impact. He eventually stopped after the mother directed several peduncle throws at him. Did she tire of his show, or was her calf becoming distressed? No sooner was the breaching finished than Galapagos sharks appeared, swimming erratically with pectoral fins lowered. Had they been attracted by the surface activity or had the breaching been directed at them as a warning? In either case, we were swimming in waters filled with many large pieces of humpback skin shed during the melee — a whale-scented chum line! Four sharks quickly approached me from below, nipping at my fins. I have been told a video camera was still recording as I yelled for the boat and scrambled aboard, rattled.

North Pacific humpback whale, peduncle throw, Megaptera novaeangliae, Maui

North Pacific humpback whale, peduncle throw.
Image ID: 02153
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

It is in large surface active pods that the potential for a heat run lies and that courtship roles become clear, although no direct evidence linking such social behavior to mating has yet been found. In-water observations allow us to examine facets of behavior not observable from the boat, including actions carried out in conjunction with social sounds. Courtship, mating and birthing activities likely occur in the North Pacific humpback wintering areas of Hawaii, Japan and Mexico. Still, the reproductive lives of humpbacks remain a mystery. Do humpbacks mate in Hawaii or on the journey back to Alaska? Where are the calves born, in sheltered waters or open ocean? Although we have recorded an uncommon underwater humpback penis display and analyzed a sample of humpback placenta, no confirmed direct observation of either mating or calving has been recorded. Pods exhibiting courtship behavior are thus valuable as they provide information about which whales are together this year, in anticipation of calves next year. These data will help us to answer broader questions about whether humpbacks form long-term social affiliations and what factors might influence such relationships.


The Hawaiian Islands Humpback Whale National Marine Sanctuary, designated by Congress in 1992, specifically recognizes the importance of the humpback whale and its winter habitat and will promote protection, research and education while monitoring both the whale and its Hawaiian environment. The Hawaii Whale Research Foundation studies humpback social affiliation and communication with the belief that if the behaviors of these magnificent animals are more fully understood, we may better offer recommendations that protect and preserve them. HWRF was founded and is directed by Dan R. Salden, Ph.D., past chair of the Department of Speech Communication at Southern Illinois University at Edwardsville. HWRF maintains a growing database of individually identified North Pacific humpback whales, including some that are known to winter in Japan and Mexico as well as Hawaii, and a video record documenting humpback behavior and social roles. HWRF is a publicly supported nonprofit organization staffed by a small group of volunteers. Five winter months of data collection and photo-documentation in Hawaii are augmented by year-round analysis, scientific publications, public service seminars and educational presentations. Field studies are governed by the provisions of NOAA Fisheries (aka, National Marine Fisheries Service) and State of Hawaii scientific research permits.

North Pacific humpback whale, Megaptera novaeangliae, Maui

North Pacific humpback whale.
Image ID: 00167
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

More information about Dr. Dan Salden and Hawaii Whale Research Foundation can be found on HWRF’s website.

As he has with all of my past articles, Skip Stubbs offered important advice.

Some humpback whale behaviors often observed in association with surface active groups (heat runs):

Breaching
Underwater bubble displays
Mother / calf pairs
Lunging
Peduncle throws and tail lobs
Pectoral fin displays
Crucifix blocking

Keywords: humpback whale, megaptera novaeangliae, surface active, behavior, rowdy group, maui, hawaii, pacific.

Photos of Humpback Whale Bubble Displays

Hawaii, Humpback Whale, Underwater Life, Wildlife

Humpback whales are famous for their use of bubbles to “net” prey, especially in Alaska where coordinated bubble netting among groups of humpback whales is often seen. However, humpbacks also commonly use bubble displays and air releases in their social interactions in warm waters. It is thought the these bubble releases are signals to nearby whales. This seems most true in humpback groups engaged in “rowdy” behaviour, in which a group of male whales is competing for position in the group, usually alongside a focal female whale. In these situations, bubbles seem to be released by male escort whales in an effort to intimidate rival escort whales, or to create a visual barrier.

North Pacific humpback whale, male escort bubble streams alongside mother and calf, Megaptera novaeangliae, Maui

North Pacific humpback whale, male escort bubble streams alongside mother and calf.
Image ID: 05926
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Bubble curtains occur when a whale swims along emitting a steady stream of bubbles. Seen from above water, the curtain becomes a bubble trail sometimes reaching a length of a hundred yards or more, and can be useful in locating whales that have been underwater for a while. Sometimes several competing males in a group will simultaneously create bubble curtains, perhaps to intimidate one another or “shield” a female from approach by a challenging male.

North Pacific humpback whale, male bubble trailing in competitive group, Megaptera novaeangliae, Maui

North Pacific humpback whale, male bubble trailing in competitive group.
Image ID: 02150
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Bubble blasts usually occur just as a whale is surfacing. They may be both an attempt to intimidate a nearby competing whale and an early exhalation in a particularly strenuous competitive group. Bubble blasts often accompany a head lunge, where the whale surfaces at speed, exhaling hard and with sufficient momentum that it drives forward with rostrum and head partially out of the water. Occasionally, singletons and inquisitive whales perform bubble displays in a non-agonistic situation as they swim near a boat or research divers.

Humpback whale lunging out of the water at it reaches the surface, exhaling in a burst of bubbles, Megaptera novaeangliae, Maui

Humpback whale lunging out of the water at it reaches the surface, exhaling in a burst of bubbles.
Image ID: 01407
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

North Pacific humpback whale, primary escort bubble trails alongside female amid competitive group, Megaptera novaeangliae, Maui

North Pacific humpback whale, primary escort bubble trails alongside female amid competitive group.
Image ID: 06034
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Keywords: humpback whale, bubble stream, blow, spout, bubble trail, bubbles, Megaptera novaeangliae, underwater.

These photographs were taken during Hawaii Whale Research Foundation research activities conducted under provisions of NOAA / NMFS and State of Hawaii scientific research permits.

Photos of Boat Strikes of Marine Animals

Environmental Problems, Humpback Whale, Marine Life, Ocean Sunfish

Boat strikes of marine animals are increasingly common, for obvious reasons. It is disappointing to observe a marine animal severely or mortally wounded by a collision with a boat. We have encountered several marine animals bearing unmistakable boat propeller scars:

North Pacific humpback whale showing extensive scarring, almost certainly from a boat propeller, on dorsal ridge, Megaptera novaeangliae, Maui

North Pacific humpback whale showing extensive scarring, almost certainly from a boat propeller, on dorsal ridge.
Image ID: 05910
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

Ocean sunfish injured by boat prop with cleaner fishes, open ocean, Baja California, Mola mola

Ocean sunfish injured by boat prop with cleaner fishes, open ocean, Baja California.
Image ID: 06410
Species: Ocean sunfish, Mola mola

West Indian manatee, Trichechus manatus, Three Sisters Springs, Crystal River, Florida

West Indian manatee.
Image ID: 02651
Species: West Indian manatee, Trichechus manatus
Location: Three Sisters Springs, Crystal River, Florida, USA

Gray whale dorsal aspect showing injury/wound/indentation likely caused by boat, Laguna San Ignacio, Eschrichtius robustus, San Ignacio Lagoon

Gray whale dorsal aspect showing injury/wound/indentation likely caused by boat, Laguna San Ignacio.
Image ID: 06426
Species: Gray whale, Eschrichtius robustus
Location: San Ignacio Lagoon, Baja California, Mexico

See more boat strike and propeller scar photos.

Keywords: propeller scar photo, boat strike, injury, photograph, boat collision.

The humpback whale photograph was taken during Hawaii Whale Research Foundation research activities conducted under provisions of NOAA / NMFS and State of Hawaii scientific research permits.<

Photos of Humpback Whale Pectoral Fin Displays

Hawaii, Humpback Whale

Humpback whales, Megaptera novaeangliae, are known for displaying a wide range of surface behaviors (i.e., behaviors seen from above water), such as breaching, head lunging, tail lobbing and spyhopping. Among these behaviors, pectoral fin displays are some of the most interesting. Humpback whales have the longest pectoral fins of all cetaceans — indeed the latin Megaptera translates to “giant wing” — and they will often lift their long fins well out of the water. This behavior can be seen when the whales are gathered in social groups as well as with solitary animals.

Humpback whale swimming inverted with both pectoral fin raised clear of the water, Megaptera novaeangliae, Maui

Humpback whale swimming inverted with both pectoral fin raised clear of the water.
Image ID: 04116
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii, USA

These photographs were taken during Hawaii Whale Research Foundation research activities conducted under NMFS scientific permits 633, 882, 587 as well as various State of Hawaii permits. Their use is subject to certain restrictions.

Keywords: humpback whale photo, megaptera novaengliae, pectoral fin.

These photographs were taken during Hawaii Whale Research Foundation research activities conducted under provisions of NOAA / NMFS and State of Hawaii scientific research permits.

The Blue Whale, Largest Animal On Earth

Blue Whale, Natural World, Underwater Life

The blue whale, Balaenoptera musculus, is the largest animal ever to have lived on Earth. Depending on which expert is cited, blue whales once attained lengths of 100 to 120 feet (32 meters) and have weighed up to 160 tons (145 metric tonnes). Blue whales are found throughout the worlds oceans. Estimates put their worldwide population at approximately 10% that of prewhaling size, and blue whales are listed as endangered throughout their range. The population of blue whales in the Southern Ocean was hunted especially hard.

A huge blue whale swims through the open ocean in this underwater photograph.  The blue whale is the largest animal ever to live on Earth, Balaenoptera musculus

A huge blue whale swims through the open ocean in this underwater photograph. The blue whale is the largest animal ever to live on Earth.
Image ID: 03027
Species: Blue whale, Balaenoptera musculus

Blue whale fluking up (raising its tail) before a dive to forage for krill,  Baja California (Mexico), Balaenoptera musculus

Blue whale fluking up (raising its tail) before a dive to forage for krill, Baja California (Mexico).
Image ID: 03332
Species: Blue whale, Balaenoptera musculus

Blue whale, adult and juvenile (likely mother and calf), swimming together side by side underwater in the open ocean, Balaenoptera musculus

Blue whale, adult and juvenile (likely mother and calf), swimming together side by side underwater in the open ocean.
Image ID: 01964
Species: Blue whale, Balaenoptera musculus

Two blue whales, a mother and her calf, swim through the open ocean in this aerial photograph.  The calf is blowing (spouting, exhaling) with a powerful column of spray.  The blue whale is the largest animal ever to live on Earth, Balaenoptera musculus, San Diego, California

Two blue whales, a mother and her calf, swim through the open ocean in this aerial photograph. The calf is blowing (spouting, exhaling) with a powerful column of spray. The blue whale is the largest animal ever to live on Earth.
Image ID: 02304
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

A huge blue whale swims through the open ocean in this aerial photograph.  The blue whale is the largest animal ever to live on Earth, Balaenoptera musculus

A huge blue whale swims through the open ocean in this aerial photograph. The blue whale is the largest animal ever to live on Earth.
Image ID: 02169
Species: Blue whale, Balaenoptera musculus

Adult blue whale surfacing,  Baja California (Mexico), Balaenoptera musculus

Adult blue whale surfacing, Baja California (Mexico).
Image ID: 03380
Species: Blue whale, Balaenoptera musculus

Two of the images above show blue whale pairs likely composed of a mother with calf/subadult. Blue whale calves will accompany their mothers for approximately a year before being weaned. Female blue whales are larger than males, an adaptation enabling a mother to cope with the physical demands of calving and nursing.

A blue whale spouts at sunset.  The blow, or spout, of a blue whale can reach 30 feet into the air.  The blue whale is the largest animal ever to live on earth, Balaenoptera musculus

A blue whale spouts at sunset. The blow, or spout, of a blue whale can reach 30 feet into the air. The blue whale is the largest animal ever to live on earth.
Image ID: 02217
Species: Blue whale, Balaenoptera musculus

Blue whale surfacing, Isla Coronado del Norte in background,  Baja California (Mexico), Balaenoptera musculus, Coronado Islands (Islas Coronado)

Blue whale surfacing, Isla Coronado del Norte in background, Baja California (Mexico).
Image ID: 03342
Species: Blue whale, Balaenoptera musculus
Location: Coronado Islands (Islas Coronado), Baja California, Mexico

Adult blue whale surfacing,  Baja California (Mexico), Balaenoptera musculus

Adult blue whale surfacing, Baja California (Mexico).
Image ID: 03381
Species: Blue whale, Balaenoptera musculus

Blue whale, the largest animal ever to inhabit earth, swims through the open ocean, underwater view, Balaenoptera musculus

Blue whale, the largest animal ever to inhabit earth, swims through the open ocean, underwater view.
Image ID: 01902
Species: Blue whale, Balaenoptera musculus

Blue whale fluke, powerful tail that propels the huge whale through the open ocean, Balaenoptera musculus

Blue whale fluke, powerful tail that propels the huge whale through the open ocean.
Image ID: 01911
Species: Blue whale, Balaenoptera musculus

Blue whale, blowhole open, Balaenoptera musculus

Blue whale, blowhole open.
Image ID: 02179
Species: Blue whale, Balaenoptera musculus

Blue whale, the largest animal ever to inhabit earth, swims through the open ocean, raising fluke (tail) before making a deep dive, Balaenoptera musculus

Blue whale, the largest animal ever to inhabit earth, swims through the open ocean, raising fluke (tail) before making a deep dive.
Image ID: 02226
Species: Blue whale, Balaenoptera musculus

Blue whale, lifting fluke before diving, Baja California, Balaenoptera musculus

Blue whale, lifting fluke before diving, Baja California.
Image ID: 03043
Species: Blue whale, Balaenoptera musculus

Blue whale fluking up before a dive,  Baja California (Mexico), Balaenoptera musculus

Blue whale fluking up before a dive, Baja California (Mexico).
Image ID: 03337
Species: Blue whale, Balaenoptera musculus

Blue whale, caudal stem, fluke with median notch, Balaenoptera musculus

Blue whale, caudal stem, fluke with median notch.
Image ID: 02220
Species: Blue whale, Balaenoptera musculus

An enormous blue whale raises its fluke (tail) high out of the water before diving.  Open ocean offshore of San Diego, Balaenoptera musculus

An enormous blue whale raises its fluke (tail) high out of the water before diving. Open ocean offshore of San Diego.
Image ID: 07519
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

Blue whale fluke,  Baja California (Mexico), Balaenoptera musculus

Blue whale fluke, Baja California (Mexico).
Image ID: 03339
Species: Blue whale, Balaenoptera musculus

Blue whales can swim fast, with bursts up to 20 knots. Long and streamlined, they are capable of sustaining speeds of 5 to 10 knots while traveling or foraging for food. Enormous muscles in a blue whale´s caudal flanks and peduncle power its wide flukes up and down.

Blue whale, dorsal aspect of caudal stem,  Baja California (Mexico), Balaenoptera musculus

Blue whale, dorsal aspect of caudal stem, Baja California (Mexico).
Image ID: 03330
Species: Blue whale, Balaenoptera musculus

Blue whale, dorsal aspect of caudal stem,  Baja California (Mexico), Balaenoptera musculus

Blue whale, dorsal aspect of caudal stem, Baja California (Mexico).
Image ID: 03340
Species: Blue whale, Balaenoptera musculus

Blue whale surfacing, dorsal fin,  Baja California (Mexico), Balaenoptera musculus

Blue whale surfacing, dorsal fin, Baja California (Mexico).
Image ID: 03344
Species: Blue whale, Balaenoptera musculus

Blue whale, exhaling, note splashguard foreward of blowholes, Baja California, Balaenoptera musculus

Blue whale, exhaling, note splashguard foreward of blowholes, Baja California.
Image ID: 03045
Species: Blue whale, Balaenoptera musculus

The splashguard of this approaching blue whale pushes water aside so that it can open its blowholes  (which are just behind the splashguard) to breathe.  Open ocean offshore of San Diego, Balaenoptera musculus

The splashguard of this approaching blue whale pushes water aside so that it can open its blowholes (which are just behind the splashguard) to breathe. Open ocean offshore of San Diego.
Image ID: 07520
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

An enormous blue whale rounds out (hunches up its back) before diving.  Note the distinctive mottled skin pattern and small, falcate dorsal fin. Open ocean offshore of San Diego, Balaenoptera musculus

An enormous blue whale rounds out (hunches up its back) before diving. Note the distinctive mottled skin pattern and small, falcate dorsal fin. Open ocean offshore of San Diego.
Image ID: 07527
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

Blue whales are most easily identified by their huge size, tall blows (up to 30 feet high), blue/gray mottled skin color, and typically rounded (falcate) dorsal fin. Skin pigment patterns along the dorsal ridge, near the dorsal fin, are photographed by scientists in order to identify individual whales. The tips of a blue whale’s fluke are rather pointed, and the trailing edge of the fluke is usually smooth and straight with a median notch. Blue whales are closely related to fin whales (Balaenoptera physalus), which are also huge, but the body of a blue whale is mottled and lighter in color and its dorsal fin is not as tall and pronounced as that of the fin whale. Also, the right lip and baleen plate of the fin whale is light colored and the underside of its body is white. (Blue and fin whales are thought to occasionally interbreed (Calambokidis)). Seen from a distance, blue whales resting or swimming just below the surface appear to be large sandbars.

An enormous blue whale swims in front of whale watchers on a private yacht.  Only a small portion of the whale, which dwarfs the boat and may be 70 feet or more in length, can be seen. Open ocean offshore of San Diego, Balaenoptera musculus

An enormous blue whale swims in front of whale watchers on a private yacht. Only a small portion of the whale, which dwarfs the boat and may be 70 feet or more in length, can be seen. Open ocean offshore of San Diego.
Image ID: 07541
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

An enormous blue whale is stretched out at the surface, resting, breathing and slowly swimming, during a break between feeding dives. Open ocean offshore of San Diego, Balaenoptera musculus

An enormous blue whale is stretched out at the surface, resting, breathing and slowly swimming, during a break between feeding dives. Open ocean offshore of San Diego.
Image ID: 07534
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

A blue whale blows (spouts) just as it surfaces after spending time at depth in search of food.  Open ocean offshore of San Diego, Balaenoptera musculus

A blue whale blows (spouts) just as it surfaces after spending time at depth in search of food. Open ocean offshore of San Diego.
Image ID: 07544
Species: Blue whale, Balaenoptera musculus
Location: San Diego, California, USA

Pelagic red tuna crab, open ocean, Pleuroncodes planipes, San Diego, California

Pelagic red tuna crab, open ocean.
Image ID: 02247
Species: Pelagic red crab, Pleuroncodes planipes
Location: San Diego, California, USA

Pelagic red tuna crabs, Coronado Islands, Pleuroncodes planipes, Coronado Islands (Islas Coronado)

Pelagic red tuna crabs, Coronado Islands.
Image ID: 02353
Species: Pelagic red crab, Pleuroncodes planipes
Location: Coronado Islands (Islas Coronado), Baja California, Mexico

Krill, Baja California (Pacific Ocean), Thysanoessa spinifera

Krill, Baja California (Pacific Ocean).
Image ID: 03117
Species: Krill, Thysanoessa spinifera

What does a huge blue whale eat? Tons (literally) of tiny euphasiid krill, such as Thysanoessa spinifera (center). Blue whales are also known to feed on aggregations of pelagic red crabs Pleuroncodes planipes (left and right).

Blue whale, the large animal ever to live on earth, underwater view in the open ocean, Balaenoptera musculus

Blue whale, the large animal ever to live on earth, underwater view in the open ocean.
Image ID: 05814
Species: Blue whale, Balaenoptera musculus

Blue whales surfacing,  Baja California (Mexico), Balaenoptera musculus

Blue whales surfacing, Baja California (Mexico).
Image ID: 03348
Species: Blue whale, Balaenoptera musculus

Scientists estimate that the largest blue ever to have lived probably weighed more than 200 tons — 400,000 pounds — and was more massive than an entire herd of thirty African elephants. A truly impressive beast, indeed. Blue whales dwarf even the largest dinosaurs, being nearly twice the size of the largest prehistoric land dweller Brachiosaurus. A small child could crawl through the chambers of a blue whale’s immense heart, or out one of its twin blowholes. Scientific accounts cite individual blue whales nearly 100 feet in length while less reliable whaling records reported giants up to 110 feet long. The largest subspecies of blue whale, intermedia, inhabits Antarctic regions while the slightly smaller musculus is found in northern hemisphere oceans.

Blue whale dorsal flank and remora, Balaenoptera musculus

Blue whale dorsal flank and remora.
Image ID: 01907
Species: Blue whale, Balaenoptera musculus

Dorsal flank showing characteristic mottled skin patterns. This particular blue whale, observed in northern Mexico, also has a few dozen remora probably acquired in warmer waters to the south.

Blue whales: mother/calf pair w/ adult,  Baja California (Mexico), Balaenoptera musculus

Blue whales: mother/calf pair w/ adult, Baja California (Mexico).
Image ID: 03354
Species: Blue whale, Balaenoptera musculus

Four blue whales (including calf) socializing,  Baja California (Mexico), Balaenoptera musculus

Four blue whales (including calf) socializing, Baja California (Mexico).
Image ID: 03357
Species: Blue whale, Balaenoptera musculus

Blue whales: mother/calf pair w/ adult,  Baja California (Mexico), Balaenoptera musculus

Blue whales: mother/calf pair w/ adult, Baja California (Mexico).
Image ID: 03369
Species: Blue whale, Balaenoptera musculus

Do blue whales socialize? Of course! But how they find one another across miles of ocean, what brings them together, and what they do when in one another´s company is still largely a mystery. Researchers around the world are gradually coming to understand the life of this greatest of whales through direct observation, remote sensing with satellite tags, and by eavesdropping on whale vocalizations with sophisticated hydrophones.

Adult blue whale surfacing, rounding out prior to dive,  Baja California (Mexico), Balaenoptera musculus

Adult blue whale surfacing, rounding out prior to dive, Baja California (Mexico).
Image ID: 03379
Species: Blue whale, Balaenoptera musculus

Blue whale, Balaenoptera musculus

Blue whale.
Image ID: 01899
Species: Blue whale, Balaenoptera musculus

Blue whales: adult pair (upper left), mother/calf pair (lower right),  Baja California (Mexico), Balaenoptera musculus

Blue whales: adult pair (upper left), mother/calf pair (lower right), Baja California (Mexico).
Image ID: 03351
Species: Blue whale, Balaenoptera musculus

All of the above photographs are of blue whales in the eastern North Pacific stock, a population that ranges from Baja California to at least as north as Oregon. Whales from this stock are often seen migrating north along the Pacific coast in spring and summer, typically stopping near Point Conception or the Farallon Islands to feed on aggregations of krill in August and September. For more information about blue whales, read Blue Whales by John Calambokidis and Gretchen Steiger, Voyageur Press; ISBN: 0896583384.

Keywords: blue whale, photo, underwater, picture, Balaenoptera musculus, aeria