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The spanish dancer is one of the largest species and best swimmers of the nudibranchs.
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The Spanish Dancer

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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One of several rowboats that were sunk in front of Lake Hotel at Wyoming's Yellowstone National Park in the early 20th century.
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Underwater Parks in 3-D

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a flounder blends into the sandy seafloor
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Fish Fins that can Taste

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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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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The Japanese spider crab may be big but it is not invincible.
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Japanese Spider Crab

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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 depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
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Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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Illustration of the Paleozoic shallow water habitat.
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A Mississippian Marine Habitat (359 - 318 Million Years Ago)

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