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.
Species: Elk, Cervus canadensis
Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming
Image ID: 19693
Sunset light and acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31315
Acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Vatu I Ra Passage, Bligh Waters, Viti Levu Island, Fiji
Image ID: 31331
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.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 02828
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.
Species: Elk, Cervus canadensis
Location: Madison River, Yellowstone National Park, Wyoming
Image ID: 19697
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.
Species: Elk, Cervus canadensis
Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming
Image ID: 19698
Various stony and soft corals on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Species: Anthias, Pseudanthias
Location: Namena Marine Reserve, Namena Island, Fiji
Image ID: 31408
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.
Species: Elk, Cervus canadensis
Location: Madison River, Yellowstone National Park, Wyoming
Image ID: 19700
Humpback whale competitive group, several adult male escort whales swimming closely together as part of a larger competitive group.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 02864
Humpback whale competitive group, several adult male escort whales swimming closely together as part of a larger competitive group.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 02862
Acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Vatu I Ra Passage, Bligh Waters, Viti Levu Island, Fiji
Image ID: 31490
Acropora table coral (left) and Staghorn Coral (Acropora palifera, right) on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Species: Staghorn coral, Table coral, Acropora palifera
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31541
Acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31549
Acropora table coral (left) and Staghorn Coral (Acropora palifera, right) on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Species: Staghorn coral, Table coral, Acropora palifera
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31553
Acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31554
Sunset light and acropora table coral on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Location: Wakaya Island, Lomaiviti Archipelago, Fiji
Image ID: 31555
Humpback whale male escort emits a stream of bubbles during competitive group socializing. The whale is swimming so fast that the bubbles pass back alongside the whale.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 02855
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 (barely seen in the distance).
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 04434
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 during competitive group activities. The bubble curtain may be meant as warning or visual obstruction to other nearby male whales interested in the female.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 04444
Large competitive group of humpback whales, eleven adult humpback whales seen in this image, part of a 16 whale competitive group.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 04459
Male North Pacific humpback whale streams a trail of bubbles. The primary male escort whale (center) creates a curtain of bubbles underwater as it swims behind a female (right), with other challenging males trailing behind in a competitive group. The bubbles may be a form of intimidation from the primary escort towards the challenging escorts.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 05968
Adult male north Pacific humpback whale bubble streaming underwater in the midst of a competitive group. The male escort humpback whale seen here is emitting a curtain of bubbles as it swims closely behind a female, . The bubble curtain may be meant as warning or visual obstruction to other nearby males interested in the female.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 05999
Adult male north Pacific humpback whale bubble streaming underwater in the midst of a competitive group. The male escort humpback whale seen here is emitting a curtain of bubbles as it swims closely behind a female, . The bubble curtain may be meant as warning or visual obstruction to other nearby males interested in the female.
Species: Humpback whale, Megaptera novaeangliae
Location: Maui, Hawaii
Image ID: 06037