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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. Bull Photo. 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. Bull Picture. Image ID: 13151 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, 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. Stock Photography of Bull. Image ID: 15458 Species: Elephant seal, Mirounga angustirostris Location: Piedras Blancas, San Simeon, California, USA

Metridium and proliferating anemones cling to bull kelp. Browning Pass, Vancouver Island. Photograph of Bull. Image ID: 35257 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada	Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island Bull Photos. Image ID: 35258 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada	Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island Bull Image. Image ID: 35262 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada

Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island Professional stock photos of Bull. Image ID: 35263 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada	Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada Pictures of Bull. Image ID: 35266 Species: Bull Kelp, Nereocystis luetkeana Location: British Columbia, Canada	Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada Bull Photo. Image ID: 35279 Species: Bull Kelp, Nereocystis luetkeana Location: British Columbia, Canada

Bullock's oriole, first year male. Bull Picture. Image ID: 22895 Species: Bullock's oriole, Icterus bullockii Location: Amado, Arizona, USA	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. Stock Photography of Bull. Image ID: 13120 Species: American bison, Bison bison Location: Yellowstone National Park, Wyoming, USA	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. Photograph of Bull. Image ID: 19697 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA

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. Bull Photos. Image ID: 19698 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA	Elk, bull elk, adult male elk with large set of antlers. By September, this bull elk's antlers have reached their full size and the velvet has fallen off. This bull elk has sparred with other bulls for access to herds of females in estrous and ready to mate. Bull Image. Image ID: 19721 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA	A male moose, bull moose, on snow covered field, near Cooke City. Professional stock photos of Bull. Image ID: 19680 Species: Moose, Alces alces Location: Yellowstone National Park, Wyoming, USA

Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Pictures of Bull. Image ID: 25890 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA	Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Bull Photo. Image ID: 25878 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA	Male elephant seals (bulls) rear up on their foreflippers and fight in the surf for access for mating females that are in estrous. Such fighting among elephant seals can take place on the beach or in the water. They bite and tear at each other on the neck and shoulders, drawing blood and creating scars on the tough hides. Bull Picture. Image ID: 20369 Species: Elephant seal, Mirounga angustirostris Location: Piedras Blancas, San Simeon, California, USA

Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island Stock Photography of Bull. Image ID: 35289 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada	A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island. Photograph of Bull. Image ID: 35295 Species: Bull Kelp, Nereocystis luetkeana Location: British Columbia, Canada	A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island. Bull Photos. Image ID: 35299 Species: Giant Plumose Anemone, Bull Kelp, Metridium farcimen, Nereocystis luetkeana Location: British Columbia, Canada

Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island Bull Image. Image ID: 35300 Species: Plumose Anemone, Bull Kelp, Metridium senile, Nereocystis luetkeana Location: British Columbia, Canada	Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada Professional stock photos of Bull. Image ID: 35331 Species: Bull Kelp, Nereocystis luetkeana Location: British Columbia, Canada	Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada Pictures of Bull. Image ID: 35337 Species: Bull Kelp, Nereocystis luetkeana Location: British Columbia, Canada

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. Bull Photo. Image ID: 19700 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA	Bull elk in sage brush with large rack of antlers during the fall rut (mating season). This bull elk has sparred with other bulls to establish his harem of females with which he hopes to mate. Bull Picture. Image ID: 19718 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA	Male elephant seals (bulls) rear up on their foreflippers and fight for territory and harems of females. Bull elephant seals will haul out and fight from December through March, nearly fasting the entire time as they maintain their territory and harem. They bite and tear at each other on the neck and shoulders, drawing blood and creating scars on the tough hides. Sandy beach rookery, winter, Central California. Stock Photography of Bull. Image ID: 15394 Species: Elephant seal, Mirounga angustirostris Location: Piedras Blancas, San Simeon, California, USA

A bull elephant seal forceably mates (copulates) with a much smaller female, often biting her into submission and using his weight to keep her from fleeing. Males may up to 5000 lbs, triple the size of females. Sandy beach rookery, winter, Central California Photograph of Bull. Image ID: 35133 Location: Piedras Blancas, San Simeon, California, USA	A bull elephant seal forceably mates (copulates) with a much smaller female, often biting her into submission and using his weight to keep her from fleeing. Males may up to 5000 lbs, triple the size of females. Sandy beach rookery, winter, Central California. Bull Photos. Image ID: 20388 Species: Elephant seal, Mirounga angustirostris Location: Piedras Blancas, San Simeon, California, USA	A bull elephant seal forceably mates (copulates) with a much smaller female, often biting her into submission and using his weight to keep her from fleeing. Males may up to 5000 lbs, triple the size of females. Sandy beach rookery, winter, Central California Bull Image. Image ID: 35132 Location: Piedras Blancas, San Simeon, California, USA