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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
Photo

Purple Sea Urchin

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A diagram of a shark's six highly refined senses: smell, hearing, touch, taste, sight, and electromagnetism
Photo

Shark Senses

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Illustration of the Paleozoic shallow water habitat.
Photo

A Mississippian Marine Habitat (359 - 318 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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a wet river otter face
Article

Fecal Insights: How River Otters Help Us Understand Parasites and Ecosystem Health

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A tornado of sardines swirls around diver and photographer Erwin Poliakoff in the Philippines.
Article

Why the Littlest Fish Matter a Whole Lot

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Freshly cut dorsal fin from a scalloped hammerhead shark held by fisherman with knife.
Article

Shark Finning: Sharks Turned Prey

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Two nurse sharks hover over a baited cage
Lesson Plan

Food Chain Hide and Seek

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Sea otters floating on the surface of the ocean.
Article

Not Just Another Fuzzy Face

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An underwater photo of Southern Bluefin Tuna swimming above a fish farm net.
Article

Tunas and Marlins Officially Classified as Threatened

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Rough periwinkles sit on a bed of barnacles.
Slideshow

A Seashore Walk

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A thresher shark was killed after becoming stuck in a gillnet.
Article

Good-Bye Gillnet, Hello Shark Recovery!

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