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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: 21613 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: 21615 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: 21616 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: 21618 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: 21609 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: 21610 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA

A sea otter, looking at the photographer as it forages for food in Elkhorn Slough. Image ID: 21611 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: 21617 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, 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	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	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	Bull elk, with large antlers, alongside female elk during rutting season, autumn. 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: 19724 Species: Elk, Cervus canadensis 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: 19746 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, 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: 19781 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA	Bull elk, with large antlers, alongside female elk during rutting season, autumn. 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: 19782 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: 19788 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: 21619 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: 21620 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: 21621 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: 21629 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: 21630 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: 21631 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: 21632 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: 21633 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: 21634 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA