Changes

Generally less actively swimming than fellow cephalopods [[squid]] and [[cuttlefish]], an octopus has eight suckered [[tentacle]]s used for attachment to rocks and to prey. To move, it may pull itself over the sea bed with its tentacles, 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 suckered [[tentacle]]s used for attachment to rocks and to prey. To move, it may pull itself over the sea bed with its tentacles, 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 are highly intelligent, and are capable of opening jars—up to four at once—and solving simple jigsaw puzzles. 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.

Octopuses, after engulfing prey in their tentacles, inject it with venom. Some, such as the blue-ringed octopus of Australia, are highly venomous and are capable of killing a man with their bite.

Octopuses, after engulfing prey in their tentacles, inject it with venom. Some, such as the blue-ringed octopus of Australia, are highly venomous and are capable of killing a man with their bite.