Octopuses eat people. They are marine mollusks that attack people when they are provoked or feel that their lives are in danger. They bite with their own mouths, and when they bite, they spread toxins. If humans are bitten by octopus, they may suffer from dizziness, nausea and vomiting. There are also some people who are unconscious and inconvenient to move. When humans faint, octopus may eat humans. In particular, some large octopuses may take the initiative to attack humans for food when they lack food.

Octopuses spray ink to protect themselves. When they are attacked, they will spray all the ink, which can block the sight of other fish. Octopuses will also use this time to escape. Octopus have a special body structure. They have an ink bag in their body, which is the place where ink is stored. Octopus can control the contraction of this ink capsule and then spit out ink.

After encountering enemies or other dangers, they will spit out ink and dye the surrounding sea water black. This ink will not only affect the enemy's vision, but also paralyze the enemy's sense of smell. Octopus can take this opportunity to escape quickly or choose other ways to hide itself.