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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: 19693 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Bull elk spar to establish harems of females, Gibbon Meadow. Image ID: 13151 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | Sandhill crane spreads its broad wings as it takes flight in early morning light. This crane is one of over 5000 present in Bosque del Apache National Wildlife Refuge, stopping here during its winter migration. Image ID: 21797 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, USA |
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| Sandhilll cranes in golden sunset light, silhouette, standing in pond. Image ID: 21798 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, 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: 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. Image ID: 19698 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| 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: 19721 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, 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. Image ID: 25890 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA | Sandhill crane in flight, wings extended. Image ID: 26197 Species: Sandhill Crane, Grus canadensis Location: Bosque Del Apache, Socorro, New Mexico, USA |
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| 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. Image ID: 25878 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, 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: 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. Image ID: 19718 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| Sandhill cranes flying, wings blurred from long time exposure. Image ID: 26216 Species: Sandhill Crane, Grus canadensis Location: Bosque Del Apache, Socorro, New Mexico, USA | Sandhill crane in flight, wings extended. Image ID: 26202 Species: Sandhill Crane, Grus canadensis Location: Bosque Del Apache, Socorro, New Mexico, USA | Bull elk, antlers bearing velvet, Gibbon Meadow. Elk are the most abundant large mammal found in Yellowstone National Park. More than 30,000 elk from 8 different herds summer in Yellowstone and approximately 15,000 to 22,000 winter in the park. Bulls grow antlers annually from the time they are nearly one year old. When mature, a bulls rack may have 6 to 8 points or tines on each side and weigh more than 30 pounds. The antlers are shed in March or April and begin regrowing in May, when the bony growth is nourished by blood vessels and covered by furry-looking velvet. Image ID: 13154 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA |
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| Elk in the Gibbon River. Image ID: 13155 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | Canada geese on the Yellowstone River. Image ID: 19569 Species: Canada goose, Branta canadensis Location: Yellowstone 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. Image ID: 19702 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| Sandhill crane portrait, as it forages in tall grass. Image ID: 21809 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, USA | Sunset at Bosque del Apache National Wildlife Refuge, with sandhill cranes silhouetted in reflection in the calm pond. Spectacular sunsets at Bosque del Apache, rich in reds, oranges, yellows and purples, make for striking reflections of the thousands of cranes and geese found in the refuge each winter. Image ID: 21804 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, USA | A sandhill crane, standing in still waters with rich gold sunset light reflected around it. Image ID: 21805 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, USA |
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| A sandhill crane in flight, spreading its wings wide which can span up to 6 1/2 feet. Image ID: 21807 Species: Sandhill crane, Grus canadensis Location: Bosque del Apache National Wildlife Refuge, Socorro, New Mexico, USA | Roosevelt elk, adult bull male with large antlers. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Image ID: 25879 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA | Roosevelt elk, adult bull male with large antlers. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Image ID: 25885 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA |
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| Sandhill cranes flying, wings blurred from long time exposure. Image ID: 26225 Species: Sandhill Crane, Grus canadensis Location: Bosque Del Apache, Socorro, New Mexico, USA | Roosevelt elk, adult bull male with large antlers. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Image ID: 25883 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, 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 |
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| Elk in the Gibbon River. Image ID: 13164 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | 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 |
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