Look at this octopus!

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octos don't have any "hard" tissue in their bodies exept for their beak. if they can squeeze the beak through something, they can make it out

they are awesome critters
 
hmm... i only heard the beak..

need to look it up fo' sho'

says the Pedia:

A beak, similar in shape to a parrot's beak, is their only hard part. This enables them to squeeze through very narrow slits between underwater rocks, which is very helpful when they are fleeing from morays or other predatory fish.

http://en.wikipedia.org/wiki/Octopus
 
Andy's right it's the beak. If the octopus can get its beak through the rest of the body can squeeze through.
 
That demo. is a really old, classic octopus experiment. It is over 30+ years old.

I had several Octopuses (that is the correct terminology - not Octopi) which I tested. They never tried escaping. At some point the experiments were terminated because it was clear the guys would never work their way out. The orifice was easily larger than their beaks. The species was Octopus bimaculoides.

Another classic is using a corked, transparent bottle with a live prey animal inside. The cork has a hole through which the Octo. can verify if the critter inside is real. Of course, my guys did total jack and never uncorked the bottle.

On the bright side, one guy came out of his little lair everyday at exactly 1:00 pm for a look-see.

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