20" x 20" Hidden Zipper in Back Linen with Feather Down Fill and Sunbrella with Faux Down Poly Fill Knife Edge or Corded Finish Octopi have three hearts, no bones and are unable to maintain their shape out of water. They have very good eyesight, but cannot hear. Like chameleons, they are able to change their color and even their skin texture to blend into their surroundings so their enemies; i.e. sharks, dolphins and eels.