Octopuses have nine brains — one central brain, eight at the base of each arm, for movement control. Two-thirds of an octopus’ neurons reside in its arms, not its head. As a result, the arms can problem solve independently of the rest of the body.
They can navigate through mazes, solve problems, take things apart, and remember solutions.
They have blue colored blood due to a protein called hemocyanin.
Octopuses evolved a copper rather than iron-based blood called hemocyanin, which is more efficient at transporting oxygen than hemoglobin.
They have three hearts. Two of the hearts work exclusively to move blood to the gills, while the third keeps circulation flowing to the organs. The systemic heart is inactive while the animal is swimming and thus it tires quickly.
A 50-pound octopus can squeeze through a hole only 2 inches in diameter. If their beak fits, they can get through. They are about 90 percent muscle.
But even stranger:
- Octopuses die shortly after mating.
- Once a male provides sperm to the female they wander off to die.
- Females lay eggs and when the eggs hatch, the female’s body undertakes a cascade of cellular suicide, rippling through her tissues and organs until she dies.
They can hide in plain sight
Octopuses are difficult to spot. Their skin changes color and pattern to blend in with their surroundings like a mirror. Even when you find yourself looking directly at an octopus you may not see it.
They can “see” with their skin
Octopus skin contains the same light-sensitive proteins present in octopus eyes.