These creatures are so fragile that the moment they are pulled out from the water, they collapse and disappear.

The Rock Pool Project in Plymouth says the non-native sea hare looks "alien-like".

Sea slugs come in all sorts of shapes, sizes, colors, and patterns. With so many different species, it feels like there’s ...

In the South China Sea, near the Paracel Islands, the aqua-colored waters of an expansive shallow reef platform suddenly gives way to a near vertical shaft of vast darkness – an ocean sinkhole almost ...