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Cystisoma (a type of hyperiid crustacean) has one huge pair of eyes.
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Giant Eyes

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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

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

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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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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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a wet river otter face
Article

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

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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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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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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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Sea otters floating on the surface of the ocean.
Article

Not Just Another Fuzzy Face

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Two nurse sharks hover over a baited cage
Lesson Plan

Food Chain Hide and Seek

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