The many-armed creatures lead dramatic lives and resolve disputes using color to mark their mood.
Sharks in key oceanic zones have less and less room free of fishing vessels, a new study finds.
A tiny but scary-looking marine critter that died out with the dinosaurs, caught prey with the aid of two monstrous eyes.
Young humpback whale calves frequently engage in extended sequences of breaching, even at a very young age.
A 5-foot-long blacktip was found floundering in the water, left there by two strangers.
A new study offers the first evidence of fish using communication to maintain cohesion of the overall group.
Future oceans will be quieter places, making it harder for young marine animals that navigate using sound to find their way home, new research finds.
Winning images capture rarely seen marine life behavior, close-ups of shy creatures and dreamy ocean scenes.
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