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A marine iguana looks off in the distance.

Audio

Marine Iguanas: One Species at a Time

A Caribbean hermit crab (Coenobita clypeatus) crawls on the forest floor.

Article

The Great Hermit Crab Migration

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

Article

So You Think You're Smarter Than a Cephalopod?

A blue-ringed octopus

Article

How Octopuses and Squids Change Color

Small red hyperiid.

Slideshow

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

Thumbnail of a cartoonish octopus.

Video

Why the Octopus Brain is so Extraordinary

A juvenile Kemp's ridley sea turtle emerges from the nest

Article

Taking the Temperature of the Kemp's Ridley Sea Turtle

Relatively slow moving, juvenile plane-head filefish Monacanthus hispidus (Monacanthidae) travel along with the algae. They pick off and eat small animals as they move around in the rotating sargassum ball. Adult filefish only grow to be about 11

Article

A World Adrift: Life in the Sargassum

A blue parrotfish hides among coral.

Article

Tough Teeth and Parrotfish Poop

On coral reefs fish are important links in the food chain that sustains higher-order predators (including humans) and keeps everything in balance.

Article

Fish Get Risky Around Oil

The Komodo National Park site in Indonesia was inscribed on the World Heritage List in 1991. The site hosts "Komodo dragons" (Varanus komodoensis), a unique species that exists nowhere else in the world and is of great interest to scientists studying evolu

Article

Tunicates—Not So Spineless Invertebrates

An adult and juvenile killer whale frolic in the water.

Article

Menopausal Moms: A Mammal Mystery