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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19693 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Bull elk spar to establish harems of females, Gibbon Meadow. Image ID: 13151 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | Full grown, mature male coastal brown bear boar (grizzly bear) in sedge grass meadows. Image ID: 19134 Species: Brown bear, Ursus arctos Location: Lake Clark National Park, Alaska, USA |
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| Adams River sockeye salmon. A female sockeye salmon swims upstream in the Adams River to spawn, having traveled hundreds of miles upstream from the ocean. Image ID: 26161 Species: Sockeye salmon, Oncorhynchus nerka Location: Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada | Northern cardinal, male. Image ID: 22891 Species: Northern cardinal, Cardinalis cardinalis Location: Amado, Arizona, USA | Bull elephant seal exits the water to retake his position on the beach. He shows considerable scarring on his chest and proboscis from many winters fighting other males for territory and rights to a harem of females. Sandy beach rookery, winter, Central California. Image ID: 15458 Species: Elephant seal, Mirounga angustirostris Location: Piedras Blancas, San Simeon, California, USA |
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| Magnificent frigatebird, adult male on nest, with throat pouch inflated, a courtship display to attract females. Image ID: 16725 Species: Magnificent frigatebird, Fregata magnificens Location: North Seymour Island, Galapagos Islands, Ecuador | Steller sea lions (Northern sea lions) gather on rocks. Steller sea lions are the largest members of the Otariid (eared seal) family. Males can weigh up to 2400 lb., females up to 770 lb. Image ID: 16977 Species: Steller sea lion, Eumetopias jubatus Location: Chiswell Islands, Kenai Fjords National Park, Alaska, USA | Magnificent frigatebird, adult female on nest. Image ID: 16726 Species: Magnificent frigatebird, Fregata magnificens Location: North Seymour Island, Galapagos Islands, Ecuador |
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| Black bear walking in a grassy meadow. Black bears can live 25 years or more, and range in color from deepest black to chocolate and cinnamon brown. Adult males typically weigh up to 600 pounds. Adult females weight up to 400 pounds and reach sexual maturity at 3 or 4 years of age. Adults stand about 3' tall at the shoulder. Image ID: 18744 Species: American black bear, Ursus americanus Location: Orr, Minnesota, USA | Sea lions underwater, adult male (left) and female (right). Image ID: 31218 Species: California sea lion, Zalophus californianus Location: Sea of Cortez, Baja California, Mexico | Sea lion harem of females, underwater. Image ID: 31228 Species: California sea lion, Zalophus californianus Location: Sea of Cortez, Baja California, Mexico |
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| Adult male humpback whale singing, suspended motionless underwater. Only male humpbacks have been observed singing. All humpbacks in the North Pacific sing the same whale song each year, and the song changes slightly from one year to the next. Image ID: 02796 Species: Humpback whale, Megaptera novaeangliae Location: Maui, Hawaii, USA | Humpback whale mother, calf (top), male escort (rear), underwater. A young humpback calf typically swims alongside or above its mother, and male escorts will usually travel behind the mother. Image ID: 02819 Species: Humpback whale, Megaptera novaeangliae Location: Maui, Hawaii, USA | Adult male humpback whale bubble streaming underwater. The male escort humpback whale seen here is emitting a curtain of bubbles as it swims behind a female (left) during a competitive group. The bubble curtain may be meant as warning or visual obstruction to other male whales interested in the mother. Image ID: 02828 Species: Humpback whale, Megaptera novaeangliae Location: Maui, Hawaii, USA |
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| Adult male humpback whale bubble streaming underwater. The male escort humpback whale seen here is emitting a curtain of bubbles as it swims behind a mother and calf. The bubble curtain may be meant as warning or visual obstruction to other nearby male whales interested in the mother. Image ID: 05925 Species: Humpback whale, Megaptera novaeangliae Location: Maui, Hawaii, USA | North Pacific humpback whale, escort in competitive group makes fast close pass. Image ID: 06057 Species: Humpback whale, Megaptera novaeangliae Location: Maui, Hawaii, USA | Pyrrhuloxia, male. Image ID: 22894 Species: Pyrrhuloxia, Cardinalis sinuatus Location: Amado, Arizona, USA |
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| Bullock's oriole, first year male. Image ID: 22895 Species: Bullock's oriole, Icterus bullockii Location: Amado, Arizona, USA | Northern cardinal, female. Image ID: 22897 Species: Northern cardinal, Cardinalis cardinalis Location: Amado, Arizona, USA | Acorn woodpecker, female. Image ID: 22906 Species: Acorn woodpecker, Melanerpes formicivorus Location: Madera Canyon Recreation Area, Green Valley, Arizona, USA |
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| Black-headed grosbeak, male. Image ID: 22911 Species: Black-headed grosbeak, Pheucticus melanocephalus Location: Madera Canyon Recreation Area, Green Valley, Arizona, USA | Brown-headed cowbird, male. Image ID: 22916 Species: Brown-headed cowbird, Molothrus ater Location: Amado, Arizona, USA | House finch, male. Image ID: 22927 Species: House finch, Carpodacus mexicanus Location: Amado, Arizona, USA |
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| Hooded oriole, female. Image ID: 22944 Species: Hooded oriole, Icterus cucullatus Location: Amado, Arizona, USA | House sparrow, breeding male. Image ID: 22945 Species: House sparrow, Passer domesticus Location: Amado, Arizona, USA | Adult female moose in deep meadow grass near Christian Creek. Image ID: 13039 Species: Moose, Alces alces Location: Christian Creek, Grand Teton National Park, Wyoming, USA |
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| The bisons massive head is its most characteristic feature. Its forehead bulges because of its convex-shaped frontal bone. Its shoulder hump, dwindling bowlike to the haunches, is supported by unusually long spinal vertebrae. Over powerful neck and shoulder muscles grows a great shaggy coat of curly brown fur, and over the head, like an immense hood, grows a shock of black hair. Its forequarters are higher and much heavier than its haunches. A mature bull stands about 6 1/2 feet (2 meters) at the shoulder and weighs more than 2,000 pounds (900 kilograms). The bisons horns are short and black. In the male they are thick at the base and taper abruptly to sharp points as they curve outward and upward; the females horns are more slender. Image ID: 13120 Species: American bison, Bison bison Location: Yellowstone National Park, Wyoming, USA | Wood duck, male. Image ID: 15694 Species: Wood duck, Aix sponsa Location: Santee Lakes, California, USA | Black bear walking in a grassy meadow. Black bears can live 25 years or more, and range in color from deepest black to chocolate and cinnamon brown. Adult males typically weigh up to 600 pounds. Adult females weight up to 400 pounds and reach sexual maturity at 3 or 4 years of age. Adults stand about 3' tall at the shoulder. Image ID: 18741 Species: American black bear, Ursus americanus Location: Orr, Minnesota, USA |
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