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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 Alaskan brown bear catching a jumping salmon, Brooks Falls, Ursus arctos, Brooks River, Katmai National Park A large, old brown bear (grizzly bear) wades across Brooks River. Coastal and near-coastal brown bears in Alaska can live to 25 years of age, weigh up to 1400 lbs and stand over 9 feet tall, Ursus arctos, Katmai National Park Full grown, mature male coastal brown bear boar (grizzly bear) in sedge grass meadows, Ursus arctos, Lake Clark National Park, Alaska Mule deer in tall grass, fall, autumn, Odocoileus hemionus, Yellowstone National Park, Wyoming Portrait of a young brown bear, pausing while grazing in tall sedge grass.  Brown bears can consume 30 lbs of sedge grass daily, waiting weeks until spawning salmon fill the rivers, Ursus arctos, Lake Clark National Park, Alaska 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, Ursus americanus, Orr, Minnesota Adult female moose in deep meadow grass near Christian Creek, Alces alces, Grand Teton National Park, Wyoming 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 Mountain lion, Sierra Nevada foothills, Mariposa, California, Puma concolor Coyote, Sierra Nevada foothills, Mariposa, California, Canis latrans Two mature brown bears fight to establish hierarchy and fishing rights, Ursus arctos, Brooks River, Katmai National Park, Alaska Brown bear waits for salmon at Brooks Falls. Blurring of the water is caused by a long shutter speed. Brooks River, Ursus arctos, Katmai National Park, Alaska 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, Ursus americanus, Orr, Minnesota 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, Ursus americanus, Orr, Minnesota Black bear in a tree.  Black bears are expert tree climbers and will ascend trees if they sense danger or the approach of larger bears, to seek a place to rest, or to get a view of their surroundings, Ursus americanus, Orr, Minnesota Black bear cub in a tree.  Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby.  Black bears have sharp claws and, in spite of their size, are expert tree climbers, Ursus americanus, Orr, Minnesota Black bear in a tree.  Black bears are expert tree climbers and will ascend trees if they sense danger or the approach of larger bears, to seek a place to rest, or to get a view of their surroundings, Ursus americanus, Orr, Minnesota 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, Ursus americanus, Orr, Minnesota 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, Ursus americanus, Orr, Minnesota Brown bear walks on tide flats.  Grizzly bear, Ursus arctos, Lake Clark National Park, Alaska Juvenile female coastal brown bear (grizzly bear) grazes on sedge grass, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear in meadow.  The tall sedge grasses in this coastal meadow are a food source for brown bears, who may eat 30 lbs of it each day during summer while waiting for their preferred food, salmon, to arrive in the nearby rivers, Ursus arctos, Lake Clark National Park, Alaska A brown bear mother (sow) stands in tall sedge grass to look for other approaching bears that may be a threat to her cubs, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear forages for razor clams in sand flats at extreme low tide.  Grizzly bear, Ursus arctos, Lake Clark National Park, Alaska Juvenile female brown bear forages for razor clams in sand flats at extreme low tide.  Grizzly bear, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear on sand flats at low tide, Ursus arctos, Lake Clark National Park, Alaska Young brown bear stands in tall sedge grass to get a better view of other approaching bears, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear walking on sand beach, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear walks in Silver Salmon Creek, Ursus arctos, Lake Clark National Park, Alaska Young brown bear grazes in tall sedge grass.  Brown bears can consume 30 lbs of sedge grass daily, waiting weeks until spawning salmon fill the rivers, Ursus arctos, Lake Clark National Park, Alaska Brown bears fighting or sparring.  These are likely young but sexually mature males that are simply mock fighting for practice, Ursus arctos, Lake Clark National Park, Alaska Mature male coastal brown bear boar waits on the tide flats at the mouth of Silver Salmon Creek for salmon to arrive.  Grizzly bear, Ursus arctos, Lake Clark National Park, Alaska Brown bear cubs.  These cubs are one and a half years old and have yet to leave their mother.  They will be on their own and have to fend for themselves next summer, Ursus arctos, Lake Clark National Park, Alaska Full grown, mature male coastal brown bear boar (grizzly bear) in sedge grass meadows, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear forages for razor clams in sand flats at extreme low tide.  Grizzly bear, Ursus arctos, Lake Clark National Park, Alaska A brown bear mother (sow) stands in tall sedge grass to look for other approaching bears that may be a threat to her cubs, Ursus arctos, Lake Clark National Park, Alaska Brown bear female sow in sedge meadow, with her three spring cubs hidden by the deep grass next to her.  These cubs were born earlier in the spring and will remain with their mother for almost two years, relying on her completely for their survival, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear in meadow.  The tall sedge grasses in this coastal meadow are a food source for brown bears, who may eat 30 lbs of it each day during summer while waiting for their preferred food, salmon, to arrive in the nearby rivers, Ursus arctos, Lake Clark National Park, Alaska Young brown bear grazes in tall sedge grass.  Brown bears can consume 30 lbs of sedge grass daily, waiting weeks until spawning salmon fill the rivers, Ursus arctos, Lake Clark National Park, Alaska Portrait of a young brown bear, pausing while grazing in tall sedge grass.  Brown bears can consume 30 lbs of sedge grass daily, waiting weeks until spawning salmon fill the rivers, Ursus arctos, Lake Clark National Park, Alaska A brown bear mother (sow) stands in tall sedge grass to look for other approaching bears that may be a threat to her cubs, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear cub, one and a half years old, near Johnson River.  This cub will remain with its mother for about another six months, and will be on its own next year, Ursus arctos, Lake Clark National Park, Alaska Lazy grizzly bear naps on a log, surrounding by the grass sedge grass that is typical of the coastal region of Lake Clark National Park, Ursus arctos Full grown, mature male coastal brown bear boar (grizzly bear) in sedge grass meadows, Ursus arctos, Lake Clark National Park, Alaska A brown bear mother (sow) stands in tall sedge grass to look for other approaching bears that may be a threat to her cubs, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear on sand flats at low tide, Ursus arctos, Lake Clark National Park, Alaska Juvenile female coastal brown bear walks on beach, Ursus arctos, Lake Clark National Park, Alaska Coastal brown bear cub, one and a half years old, near Johnson River.  This cub will remain with its mother for about another six months, and will be on its own next year, Ursus arctos, Lake Clark National Park, Alaska   more ...

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Updated: August 9, 2020