There’s a specific term for these irregular pearls: “baroque,” from the Portuguese barroco.

A "cleaner station" is a sort of undersea business, a place where large, often predatory, fish go to have parasites removed.

Undersea volcanoes, like Hawaii's Kīlauea, foster diverse ecosystems in an environment far from sunlight—and as acidic as lemon juice.

When it comes to camouflage, the sand octopus has some truly amazing techniques.

Living shorelines provide erosion control while providing shoreline habitat and maintaining coastal processes.

First things first: eels are fish.

The southern resident killer whales of the northeast Pacific are in trouble. As habitats and food dwindle, they increasingly miscarry and lose their babies.

An interview with shark biologist Dr. David Ebert, discoverer of the ninja lanternshark.