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The first known filter feeder is a large shrimp-like creature called Tamisiocaris borealis. The feather-like structures on its head were used to rake plankton from the sea.
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The First Filter Feeder

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Chrysaora melanaster is a jellyfish found in the Arctic.
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World Oceans Day 2012

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A submersible explores the deep reefs off of Curacao in the Caribbean.
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Keeping Exploration Alive With Manned Submersibles

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a veterinarian listens to a dolphin's heartbeat
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Heart Check Up

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a boat sets traps.
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Pots and Traps

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Polar bear siblings in the Churchill Wildlife Management Area near Hudson Bay spar playfully during migration.
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Polar bears at play

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Polar bear siblings in the Churchill Wildlife Management Area near Hudson Bay spar playfully during migration.
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Polar bears at play

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Two nurse sharks hover over a baited cage
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Fishing for the Future

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A narwhal breaches the surface, its tusk pointed to the sky
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Tusks of Mystery

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Smithsonian scientists apply a plaster bandage cap to a block of rock containing fossils
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Securing the Fossil

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A sea sponge underwater
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Sponges of the Sea

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In 2011, storms and lack of ice-cover due to a warmer winter climate resulted in hundreds of seal pups being washed up on the shore of Prince Edward Island. Like many, this young seal faced an uncertain future. See more Nature's Best Photos.
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Harp Seal, Prince Edward Island National Park, Canada

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