Changes

==Description==

==Description==

Generally less actively swimming than fellow cephalopods [[squid]] and [[cuttlefish]], an octopus has eight flexible suckered [[arm]]s, used for grasping [[rock]]s and prey as well as proppelling the octopus. These are often inaccurately referred to as "tentacles", but in fact that term refers specifically to two longer extremities which cuttlefish and squid have at the front of their bodies but octopuses do not.  To move, it may pull itself over the [[sea]] bed with its arms, but when in a hurry, it shoots a [[jet]] of water out of its body, thrusting it through the water.  

Generally less actively swimming than fellow cephalopods [[squid]] and [[cuttlefish]], an octopus has eight flexible suckered [[arm]]s, used for grasping [[rock]]s and prey as well as propelling the octopus. These are often inaccurately referred to as "tentacles", but in fact that term refers specifically to two longer extremities which cuttlefish and squid have at the front of their bodies but octopuses do not.  To move, it may pull itself over the [[sea]] bed with its arms, but when in a hurry, it shoots a [[jet]] of water out of its body, thrusting it through the water.  

Octopuses use [[chromatophore]]s to perfectly camouflage themselves against their background. When threatened, they can eject a cloud of ink to mask their escape. They can compress their bodies to fit through minute apertures.

Octopuses use [[chromatophore]]s to perfectly camouflage themselves against their background. When threatened, they can eject a cloud of ink to mask their escape. They can compress their bodies to fit through minute apertures.