Named for the undulating waves of its broad, fleshy appendages—called parapodia—lettuce sea slugs appear in a range of colors ...

Each killer whale has a distinct pattern of pigmentation behind its dorsal fin. How do these patterns vary around the world?

The wooden fishing boat chugs across Comau Fjord, a finger of dark water wedged between the snowy peaks of Chilean Patagonia. A Chilean flag flaps in the wind above a hand-painted black cormorant on ...

Decades after they were hunted to local extinction, fin whales are recovering in the Kitimat fjord system—only to be threatened by a booming LNG industry.

A unique fjord in Chilean Patagonia gives scientists a chance to unlock the reproductive secrets of cold-water corals that typically live thousands of meters below the ocean’s surface.