Deep-sea creatures often look more like science fiction monsters than marine animals. The glass octopus is one such animal.

Here is a list of eight of the world's rarest animals. This critically endangered porpoise, found only in the Gulf of California, has fewer than 30 individuals remaining, making it the rarest marine ...

Deep beneath the Indonesian waters, the Mimic Octopus showcases an extraordinary survival strategy. This master of disguise can transform its body to resemble various sea creatures, including ...