Crazy living rock is one of the weirdest creatures we've ever seen
The fact that this sea creature looks exactly like a rock with guts is not even the weirdest thing about it. It's also completely immobile like a rock -- it eats by sucking in water and filtering out microorganisms -- and its clear blood mysteriously secretes a rare mineral called vanadium. Also, it's born male, becomes hermaphroditic at puberty, and reproduces by tossing clouds of sperm and eggs into the surrounding water and hoping they knock together.
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