Описание осьминога на английском языке

An octopus has three hearts. Importantly surpasses the blood through the body. Others pushing it through their gills. Due to the fact that in the plasma and erythrocytes present hemocyanin (in which the copper replaces the iron) instead of hemoglobin, the blood of the animals blue. An octopus has large eyes with rectangular pupils. The head of the animal is well developed, has a cartilaginous skull.