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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: 21622 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA	Sea otter, swimming at the ocean surface. Image ID: 21623 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: 21624 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: 21625 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: 21626 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: 21627 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: 21628 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: 21635 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA	A sea otter mother hold her pup on her stomach as she rests floating on her back. This pup, just a few days old, probably weighs between 3 and 5 pounds. The pup still has the fluffy fur it was born with, which traps so much fur the pup cannot dive and floats like a cork. Image ID: 21636 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA

A sea otter mother pulls her days-old pup through the water. The pup still has the fluffy fur it was born with, which traps so much fur the pup cannot dive and floats like a cork. Image ID: 21637 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: 21638 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: 21639 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: 21640 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA	Tourists get a good look at wild elk who have become habituated to human presence in Yellowstone National Park. Image ID: 13161 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA	Tourists get a good look at wild elk who have become habituated to human presence in Yellowstone National Park. Image ID: 13192 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, USA

Coyote crosses a road in front of a car. Dozens of coyotes, wolves, bears, elk and bison are killed each year in Yellowstone as they attempt to cross the roads in front of drivers who are not paying attention or speeding. Image ID: 19649 Species: Coyote, Canis latrans 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: 19694 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, 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: 19696 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: 19705 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: 19711 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: 19726 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA

Juvenile elk, autumn. Image ID: 19727 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: 19729 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: 19731 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: 19735 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: 19736 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: 19737 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: 19739 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: 19744 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, 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: 19745 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA