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Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea.
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Whales Returned to the Sea

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A photo of a swimming Protanguilla palau, the newly discovered genus and species of eel
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Scientists Call New Eel Species A Living Fossil

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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
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The Design of a Beautiful Weapon

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A 3-D reconstruction of the skull of a fin whale fetus.
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Keeping An Ear Out For Whale Evolution

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The Belize Barrier Reef Reserve System consists of the largest barrier reef in the northern hemisphere, offshore atolls, and several hundred sand cays, mangrove forests, coastal lagoons, and estuaries. The system's seven sites illustrate the evolutionary h
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Charles Darwin's Ocean Upwelling

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Sea lions generate thrust, or forward propulsion, by bringing their fore-flippers together in big sweeping motions called “claps.”  When a sea lion “claps,” it stretches its flippers out to the sides and sweeps them down. Then it tucks its flippe
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How Do Sea Lions Swim?

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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Cambrian Period (542 – 488 Million Years Ago)

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Illustration of a four-legged proto-whale with webbed feet.
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Early Whale with Webbed Feet

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The Galapagos Islands site in Ecuador was inscribed on the World Heritage List in 1978. Located in the equatorial Pacific Ocean nearly 1000 km from South America, the Galapagos Islands and the surrounding marine reserve are a unique "living museum and show
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Sally Lightfood Crab, Galápagos Islands, Ecuador

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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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An illustration of multispecies communities of dugongs from India, Mexico and Florida
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Multispecies Communities of Seacows

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