Biologists thought that marine heat waves lowered urchin reproduction only at lethal temperatures. A new study shows ...

The pointy shell of sea urchins hides a remarkably complex neural network that resembles the brains of vertebrates, new research suggests.

Covered in lush fur, the thickest in the animal kingdom, sea otters can live their entire lives in the ocean, feeding heavily upon seafloor animals such as shellfish and crustaceans. Eelgrass meadows ...

Beneath the waves are millions of dangerous sea creatures – and they exist on every continent, from Oceania to Asia and ...