Bizarre Sea Slug Is Half Plant, Half Animal

It looks like any other sea slug, aside from its bright green hue. But the Elysia chlorotica is far from ordinary: it is both a plant and an animal, according to biologists who have been studying the species for two decades.

Not only does Elysia chlorotica turn sunlight into energy - something only plants can do - it also appears to have swiped this ability from the algae it consumes.