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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: 21653 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: 21656 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA	A raft of sea otters. A raft is a congregation of sea otters, usually in a resting mode. While rafting sea otters appear to suggest a tendancy toward a group social structure, sea otters can also be solitary animals. Image ID: 21657 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: 21658 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: 21659 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: 21660 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: 21661 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: 21662 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: 21663 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: 21664 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: 21665 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: 21666 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: 21667 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: 21668 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: 21669 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: 21670 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA	A sea otter mother floats alongside 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: 21671 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: 21672 Species: Sea otter, Enhydra lutris Location: Elkhorn Slough National Estuarine Research Reserve, Moss Landing, California, USA

Bull elk spar to establish harems of females, Gibbon Meadow. Image ID: 13152 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk in the Gibbon River. Image ID: 13153 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk in the Gibbon River. Image ID: 13156 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA

Elk rest in tall grass during the midday heat, Gibbon Meadow. Image ID: 13157 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk graze and rest among wildflowers blooming in the Gibbon Meadow, summer. Image ID: 13158 Species: Elk, Cervus canadensis Location: Gibbon Meadows, 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: 13160 Species: Elk, Cervus canadensis Location: Yellowstone National Park, Wyoming, 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: 13162 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk grazing among wildflowers in Gibbon Meadow. Image ID: 13163 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, 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: 13165 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, 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: 13166 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk in the Gibbon River. Image ID: 13167 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA	Elk in the Gibbon River. Image ID: 13168 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA