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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: 19747 Species: Elk, Cervus canadensis Location: 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: 19749 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: 19750 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| Small group of female and juvenile elk. Image ID: 19758 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, 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: 19767 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: 19773 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA |
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| 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: 19779 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21643 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21644 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21645 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21646 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21647 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21648 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21654 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter resting, holding its paws out of the water to keep them warm and conserve body heat as it floats in cold ocean water. Image ID: 21655 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21673 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21674 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter resting, holding its paws out of the water to keep them warm and conserve body heat as it floats in cold ocean water. Image ID: 21675 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21676 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21677 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21678 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter, resting on its back, holding its paw out of the water for warmth. While the sea otter has extremely dense fur on its body, the fur is less dense on its head, arms and paws so it will hold these out of the cold water to conserve body heat. Image ID: 21679 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting and floating on its back, in Elkhorn Slough. Image ID: 21680 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | Female elk in early autumn snowfall. Image ID: 19762 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| A sea otter, looking at the photographer as it forages for food in Elkhorn Slough. Image ID: 21641 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter resting, holding its paws out of the water to keep them warm and conserve body heat as it floats in cold ocean water. Image ID: 21642 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | Sea otters, resting on the surface by lying on their backs, in a group known as a raft. Image ID: 21649 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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| A sea otter resting, holding its paws out of the water to keep them warm and conserve body heat as it floats in cold ocean water. Image ID: 21650 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter, resting on its back, grooms the fur on its head. A sea otter depends on its fur to keep it warm and afloat, and must groom its fur frequently. Image ID: 21651 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA | A sea otter eats a clam that it has taken from the shallow sandy bottom of Elkhorn Slough. Because sea otters have such a high metabolic rate, they eat up to 30% of their body weight each day in the form of clams, mussels, urchins, crabs and abalone. Sea otters are the only known tool-using marine mammal, using a stone or old shell to open the shells of their prey as they float on their backs. Image ID: 21652 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA |
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