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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 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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the skull of a mosasaur
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Meals of the Mighty Mosasaur

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Fossil mosasaur skull and partial skeleton sitting in what looks like the dirt it was excavated from.
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If You Build An Ocean, Sea Monsters Will Come

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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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