In a living squid, one end of the mantle is sealed closed and adorned with two flexible fins that can flap like wings. The other end is open to the sea. Here the squid sucks water in and squeezes it out through a siphon, creating a jet stream that propels the animal through the sea and even into the air. (Not all squid can fly, but the ones that do can travel up to 165 airborne feet/50 m before splashing down.)
