2, octopus is a cephalopod, *** have 8 carpals, long in the head.

3, octopus is the highest intelligence of all invertebrates.

4, octopus skin with a highly developed pigment-containing cells, can very quickly change body color. Octopus body color can be used as a protective color, it is also said to reflect the mood of the octopus.

5, the octopus relies on the water into the outer coat membrane, through the short funnel-shaped body tube water out of the body to breathe. Octopus will be frightened from the body tube water flow, by hydrodynamic jet quickly move in the opposite direction, thereby avoiding danger.

6, octopus in danger will spray ink-like material, as a smoke screen, to avoid danger.