How Fast Is Common Octopus?

Common octopuses jet through water at 25 km/h. They have nine brains — one central, plus one in each arm — and blue blood, thanks to copper-based hemocyanin instead of iron-based hemoglobin. They can squeeze through any gap larger than their beak.

An octopus has 9 brains and 3 hearts — and can squeeze through any gap larger than its beak.

• Nine brains — one central, plus one per arm
• Can squeeze through any gap larger than their beak