Octopus is a water creature that is hard to find. It has eight limbs and three hearts.
It can change colour while sleeping. In laboratory it was observed, there are two stages of its sleep, one is quite sleeping and other is active sleeping.
In quite sleep, it remains motionless and the skin is pale.
In active sleep, it can change its skin colour, move its eyes and make muscular motions slightly.
Unworldy charcteristics of Octopus are it has blue blood, it can squirt ink and camouflage its body. One of its interesting fact is, it dies after mating.
Octopus is highly intelligent and is one of the smallest invertebrates in the world.
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