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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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming Bull elk spar to establish harems of females, Gibbon Meadow, Cervus canadensis, Gibbon Meadows, Yellowstone National Park, Wyoming 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, Mirounga angustirostris, Piedras Blancas, San Simeon Metridium and proliferating anemones cling to bull kelp. Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana Bullock's oriole, first year male, Icterus bullockii, Amado, Arizona 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, Bison bison, Yellowstone National Park, Wyoming 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, Cervus canadensis, Madison River, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming A male moose, bull moose, on snow covered field, near Cooke City, Alces alces, Yellowstone National Park, Wyoming 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, Cervus canadensis roosevelti, Redwood National Park, California 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, Cervus canadensis roosevelti, Redwood National Park, California 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, Mirounga angustirostris, Piedras Blancas, San Simeon, California 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, Mirounga angustirostris, Piedras Blancas, San Simeon Bull elephant seal, adult male, bellowing. Its huge proboscis is characteristic of male elephant seals. Scarring from combat with other males, Mirounga angustirostris, Piedras Blancas, San Simeon, California Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island, Nereocystis luetkeana A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island, Metridium farcimen, Nereocystis luetkeana Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana Southern elephant seal, adult male, Mirounga leonina, Valdes Peninsula, Argentina, Puerto Piramides, Chubut Southern elephant seal, adult male, Mirounga leonina, Valdes Peninsula, Argentina, Puerto Piramides, Chubut 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, Cervus canadensis, Madison River, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming 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, Mirounga angustirostris, Piedras Blancas, San Simeon 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, Mirounga angustirostris, Piedras Blancas, San Simeon Bull elephant seal, adult male, bellowing. Its huge proboscis is characteristic of male elephant seals. Scarring from combat with other males, Mirounga angustirostris, Piedras Blancas, San Simeon, California 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, Mirounga angustirostris, Piedras Blancas, San Simeon 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, Mirounga angustirostris, Piedras Blancas, San Simeon 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, Mirounga angustirostris, Piedras Blancas, San Simeon 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, Mirounga angustirostris, Piedras Blancas, San Simeon Bull elephant seal, adult male, bellowing. Its huge proboscis is characteristic of male elephant seals. Scarring from combat with other males, Mirounga angustirostris, Piedras Blancas, San Simeon, California Metridium senile anemones cover the reef below a forest of bull kelp, Browning Pass, Vancouver Island, Metridium senile, Nereocystis luetkeana A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island, Metridium farcimen, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island, Nereocystis luetkeana Bull kelp forest near Vancouver Island and Queen Charlotte Strait, Browning Pass, Canada, Nereocystis luetkeana Invertebrate life clings to stalks of bull kelp. Browning Pass, Vancouver Island, Nereocystis luetkeana Invertebrate life clings to stalks of bull kelp. Browning Pass, Vancouver Island, Nereocystis luetkeana A forest of bull kelp rises above a colorful cold water reef, rich with invertebrate life. Browning Pass, Vancouver Island, Metridium farcimen, Nereocystis luetkeana Purple sponge with white and orange metridium anemones, below bull kelp forest, Browning Pass, Vancouver Island, Nereocystis luetkeana Plumose anemones and Bull Kelp on British Columbia marine reef, Browning Pass, Vancouver Island, Canada, Metridium senile, Nereocystis luetkeana Plumose anemones and Bull Kelp on British Columbia marine reef, Browning Pass, Vancouver Island, Canada, Metridium senile, Nereocystis luetkeana Anemones cling to Bull Kelp Stalk, Browning Pass, British Columbia, Nereocystis luetkeana   more ...

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Updated: August 2, 2021