Meet the cuttlefish. Although it isn't a fish, it's a cephalopod. Ya know, the same genre Octopi and Squid belong to. Cuttlefish, like the octopus, is a master of disguise. It can easily change its body to blend in with the ground below it. It eats crustaceans, but mainly crabs. They snag prey by shooting out 2 long tentacles they keep concealed in a similar manner to squids.

Taken at the New England Aquarium.