Common Octopus

Eight arms, three hearts, and a talent for escape/Marine Life

The common octopus (Octopus vulgaris) has three hearts, blue blood, nine brains (one central and one in each arm), and can change color and texture in milliseconds. It can squeeze through any opening larger than its beak, which is the only hard part of its body. They are remarkably intelligent, capable of unscrewing jars, solving mazes, and recognizing individual humans.