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the skull of a mosasaur
Article

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.
Article

If You Build An Ocean, Sea Monsters Will Come

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An ancient whale ancestor
Video

Evolution of Whales Animation

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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
Slideshow

The Ocean Throughout Geologic Time, An Image Gallery

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
Slideshow

A Collection of Cambrian Fossils

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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.
Photo

The First Filter Feeder

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A 3-D reconstruction of the skull of a fin whale fetus.
Article

Keeping An Ear Out For Whale Evolution

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A researcher holds an arm bone from a "toothed" mysticete whale from Vancouver Island.
Article

Dispatches from the Field: Treacherous stream crossings and a new fossil find

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Nick Pyenson points to a skull and skeleton of a fossil whale.
Article

Excavating a "toothed" baleen whale from Vancouver Island

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An illustration of multispecies communities of dugongs from India, Mexico and Florida
Photo

Multispecies Communities of Seacows

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A close-up image of a fossil shark jaw with teeth.
Article

Shark Teeth Tell Great White Shark Evolution Story

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Illustration of a four-legged proto-whale with webbed feet.
Photo

Early Whale with Webbed Feet

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