When it comes to octopus facts, on of the more amazing ones is that it has absolutely no bones. The only structure anatomical structure is the beak around the mouth, which is similar to your fingernails. By the way, octopuses’ bites are poisonous to their prey.
The octopus has an excellent eyesight and well-developed brain. It can instantly change the color and texture of its skin to match the surrounding area. This camouflage is a major method of protection.
The body of the octopus looks like a bag. It moves as the octopus breathes. Inside the mantle (the body) there are 3 hearts, the stomach and other organs. One heart pumps blood through each gill at the end of each of the two appendages. Water flows over the gills and fills the mantle when the octopus breathes in. The water is forced out a tube call the siphon as the octopus breathes out. It can force water through the siphon rapidly and jet itself backwards if the octopus is trying to escape a predator. Using jet propulsion, octopuses travel many kilometers. An octopus can protect itself temporarily blinding an attacker by squirting ink at it. The third heart pumps the blood through the body. The octopus blood is light blue.