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| Coyote. Image ID: 19666 Species: Coyote, Canis latrans Location: 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. Image ID: 19702 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Mule deer in tall grass, fall, autumn. Image ID: 19580 Species: Mule deer, Odocoileus hemionus Location: Yellowstone National Park, Wyoming, USA |
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| Bison grazes amid grass fields along the Madison River. Image ID: 19602 Species: American bison, Bison bison Location: Madison River, Yellowstone National Park, Wyoming, USA | Grizzly bear, autumn, fall, brown grasses. Image ID: 19613 Species: Grizzly bear, Ursus arctos horribilis Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | Grizzly bear in snow. Image ID: 19616 Species: Grizzly bear, Ursus arctos horribilis Location: Lamar Valley, Yellowstone National Park, Wyoming, USA |
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| The Pronghorn antelope is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators. Image ID: 19626 Species: Pronghorn antelope, Antilocapra americana Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | The Pronghorn antelope is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators. Image ID: 19627 Species: Pronghorn antelope, Antilocapra americana Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | A male moose, bull moose, on snow covered field, near Cooke City. Image ID: 19681 Species: Moose, Alces alces Location: Yellowstone National Park, Wyoming, USA |
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| A male moose, bull moose, on snow covered field, near Cooke City. Image ID: 19682 Species: Moose, Alces alces Location: Yellowstone National Park, Wyoming, USA | Elk graze and rest among wildflowers blooming in the Gibbon Meadow, summer. Image ID: 13159 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | Elk in the Gibbon River. Image ID: 13164 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA |
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| Large male elk (bull) in snow covered meadow near Madison River. Only male elk have antlers, which start growing in the spring and are shed each winter. The largest antlers may be 4 feet long and weigh up to 40 pounds. Antlers are made of bone which can grow up to one inch per day. While growing, the antlers are covered with and protected by a soft layer of highly vascularised skin known as velvet. The velvet is shed in the summer when the antlers have fully developed. Bull elk may have six or more tines on each antler, however the number of tines has little to do with the age or maturity of a particular animal. Image ID: 19692 Species: Elk, Cervus canadensis 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. Image ID: 19695 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA | Female elk along the Madison River during an early fall snow. Image ID: 19701 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA |
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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: 19703 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA | Juvenile elk in golden, late afternoon light, in meadow along Madison River, autumn. Image ID: 19704 Species: Elk, Cervus canadensis 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. Image ID: 19708 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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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: 19714 Species: Elk, Cervus canadensis 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. Image ID: 19716 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. Image ID: 19699 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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| A coyote hunts for voles in tall grass, autumn. Image ID: 19638 Species: Coyote, Canis latrans Location: Yellowstone National Park, Wyoming, USA | Juvenile elk in golden, late afternoon light, in meadow along Madison River, autumn. Image ID: 19709 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA | Female and young elk in early autumn snowfall. Image ID: 19713 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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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: 19715 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Juvenile elk in golden, late afternoon light, in meadow along Madison River, autumn. Image ID: 19717 Species: Elk, Cervus canadensis 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. Image ID: 19719 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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| Juvenile elk in golden, late afternoon light, in meadow along Madison River, autumn. Image ID: 19720 Species: Elk, Cervus canadensis Location: 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. Image ID: 19722 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA | Male elk (bull) alongside female elk in grassy meadow, during rutting season. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem. Image ID: 19723 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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