Octopus has nine brains, three hearts, blood is blue.

Octopuses are temperate mollusks that live underwater and are adapted to water temperatures that cannot fall below 7 degrees Celsius, with a specific gravity of seawater of 1.021 being optimal, and low salinity environments will kill them. They can change shape, movement and behavior, mimicking at least 15 different species.

Octopus characteristics:

Octopuses have a head of about 7-9.5 centimeters, with large compound eyes and eight retractable tentacles on the head, and two rows of fleshy suction cups on each wrist. The squid has an elongated body and a pair of well-developed gills around the mouth on both sides of the head. Octopus lives underwater, adapted to the water temperature can not be lower than 7 ℃, the specific gravity of seawater 1.021 is most suitable, low salinity environment will die.