The octopus's ink sac also helps it avoid attack. It releases a disorienting black cloud that is accompanied by another secretion to dull the attacker's sense of smell.

The first writing ink was made from pigment found in the octopus's sac.

The octopus is messy. It is easy to identify its lair by the pile of discarded shells outside the entrance.

If an octopus damages one of its vital arms, it can grow a new one.

The octopus is capable of learning. In an experiment, octopi were trained to distinguish between shapes and also to recognize objects by touch.

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