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Ancient sea cow vertebra found in the Gatun Formation in Central America, Panama
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Ancient Sea Cow Vertebra

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Photo of a Hawaiian monk seal on the beach, with the ocean in the background.
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The Endangered Hawaiian Monk Seal

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An artist sketches the preserved bones of a specimen in the Smithsonian's collection.
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Flippers, Jawbones, and Blowholes: Marine Specimens Inspire Artists

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A polar bear lifting his head to smell the scent of humans nearby
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Polar Bear Impacted by Climate Change

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Two sea lions interact amongst schools of small fish.
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Seal or Sea Lion?

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“The southern elephant seal is a truly restrained behemoth. Males can grow to be five times larger than females, up to 5,000 pounds. This elephant seal may look fierce, but he was simply yawning over and over in the wave-wash. This allowed me to try mult
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Southern Elephant Seal, Gold Harbour, South Georgia

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Elephant seals' eyes are specialized to dim light and, in particular, to light at the wavelength of 485 nm -- which is the same wavelength given off by the bioluminescent lanternfish that are the seals' main prey.
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Elephant Seals Laze on the Beach

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A common dolphin with calf jump through the ocean.
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Common Dolphin and Calf

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A pod of Baird's beaked whales in the eastern North Pacific.
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Baird's Beaked Whales

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A male sperm whale feeding near the surface.
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Sperm Whale Shows His Teeth

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Narwhals with their long unicorn-like tusks.
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Narwhals Breaching

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A harp seal pup rests on the ice at sunset in the Gulf of St. Lawrence, Canada.
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Harp Seal Pup at Sunset

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