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

Early Whale with Webbed Feet

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
Article

With Every Breath You Take, Thank the Ocean

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This family tree shows how the ancestors of whales moved gradually from land to sea.
Photo

The Whale Family Tree

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
Article

So You Think You're Smarter Than a Cephalopod?

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Rough periwinkles sit on a bed of barnacles.
Article

Spirals in Time: A Walk at the Seashore

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

Whales Returned to the Sea

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Small red hyperiid.
Slideshow

The Hyper Eyes of Hyperiids: How Some Shrimp-Like Creatures See Light in the Deep Sea

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

Cambrian Period (542 – 488 Million Years Ago)

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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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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!
Article

The Design of a Beautiful Weapon

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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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A screenshot from the video showing a Palauan primitive cave eel.
Video

Video of the Palauan primitive cave eel (Protanguilla palau)

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