Pyura chilensis — the living rock
Pyura chilensis, as they call it in Chile, is weird to the eye and delicious to the tongue. Before you ask why anyone would eat a stone, it’s not a stone. It is a marine filter feeder similar to sea squirts but with no brain or sensory organs.
It is born a male, but it produces female organs and then reproduces on its own. Its blood contains a metal called vanadium, and it is a delicacy amongst the locals of Chile and Peru.