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This bait ball shows how small fish can react when larger predators are near, gathering tightly together in a ball-like formation that exposes the least number of fish.
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Bait Ball

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A nudibranch showing a closeup of their fleshy, tentacle-like growths, called cerata.
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How Sea Slugs Steal the Defenses of Their Prey

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Two of the worlds largest jellyfish, the lions mane jellyfish, float together.
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Extreme Jellyfish

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Once common in the West Indies, the Black Capped Petrel (Pterodroma hasitata), which breeds in high Caribbean mountains, is now on the endangered species list.
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Black-Capped Petrel

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Two clams, a mussel, an oyster, on a bed of algae
Article

Shellfish for Dinner: More than just Clams and Oysters

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Blue whale skull being installed at National Museum of Natural History.
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When Did Today’s Whales Get So Big?

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Two Adélie penguins on Paulet Island, Antarctica
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Penguins

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A bamboo shark grows in a thick egg case. Even within the egg case, the embryonic sharks can sense predators nearby and, in response, stop all gill movement and hold still to slip under the radar.
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Shark Embryo

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Two nurse sharks hover over a baited cage
Lesson Plan

Understanding Sea Level Using Real Data

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A manatee swims in Crystal River, Florida.
Article

Brian Skerry Voting Results

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an elephant seal with a tracker
Article

Citizens of the High Seas

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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
Overview

Sea Stars, Urchins, and Relatives

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