Adaptations

A photo of a squid using bioluminescence to hide in the deep sea.

Bioluminescence

You may have seen the sparkle of fireflies on a summer’s night. The fireflies produce light through a chemical reaction in their glowing abdomens, a process known as bioluminescence. But did you know that...
A reddish-orange nudibranch.

A Collage of Nudibranch Colors

Nudibranchs are a kind of sea slug, and their 3000 species are found from the poles to the tropics in both shallow and deep water. Though they often only reach two centimeters in length,...
A Greenland shark photographed in the St. Lawrence Estuary, near Baie-Comeau, Quebec

Greenland Shark: One Species at a Time

Scientists know the Greenland shark ( Somniosus microcephalus ) moves slowly in the Arctic's cold water. They also know that parasites attack the shark's eyes. But much about this animal remains a mystery. Marine...
Small red hyperiid.

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

Hyperiid amphipods are small crustaceans related to sand fleas and distantly related to shrimp. They range in size from very tiny to more than 7 inches long, and are found at all depths of...
Mangrove roots provide an underwater habitat for many marine species.

Mangroves: Photos of Plants and Animals

Mangrove is the name for a tree—and also for a complex ecosystem—that bridges land and sea. There are around 70 species of mangrove trees (meaning trees that can grow in salty water and soils),...

Spirals in Time: A Walk at the Seashore

When I set out to write a book about mollusks (called Spirals in Time ), I wasn't quite prepared for just how many animals I would get to know. There are somewhere between 100,000...
Riftia tubeworm (Riftia pachyptila) colonies near hot spring.

The Microbes That Keep Hydrothermal Vents Pumping

These tubeworm colonies grow where hot, mineral-laden water flows out of the seafloor in undersea hot springs. Credit: ©2003 MBARI By Lyndsy Gazda & the Ocean Portal Team Life is typically sparse on the...
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With Every Breath You Take, Thank the Ocean

Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions. Credit: George Cathcart By Kalila Morsink When was the last time you thought about your breathing? Take a...
A school of bluefin tuna

The Great Pacific Migration of Bluefin Tuna

The Pacific bluefin tuna are one of three bluefin species, including the Atlantic bluefin ( Thunnus thynnus) and the Southern bluefin ( Thunnus maccoyii) . Credit: NOAA Shortly after their first birthday, Pacific bluefin...