Octopus eyes grow on both sides of the head. They belong to Octophalopoda, cephalopoda, mollusca, with large volume and obvious eyes. Big octopuses in the deep sea have very large eyes, and their eyes, like humans, project images on the big retina through crystals. Their greatest feature is that they can spray ink, and they can change body color and structure like chameleons. Therefore, their ability to hunt prey is very strong, and some prey don't know what happened after being caught. Octopus is a temperate mollusk, which likes to live underwater, but cannot accept water temperature below 7 ℃.

The octopus's mouth grows at the place where the root of the tentacle connects with the head, to be precise, the octopus's mouth is below their head. Octopus are mollusks, and their tentacles and heads are directly connected. In the middle of the connection between tentacles and head is the mouth. Their mouths are different from those of other animals. They are made up of five horned parts, which are similar to the beak of birds. Although their mouths are not obvious, they can be easily observed when they eat. Octopus don't swallow it directly when eating. They clean up their prey with suckers and then put it in their mouths.