Octopuses have 3 hearts.
Octopuses move with a simple elegance, but they have no rhythm, unlike most animals.
A baby octopus is about the size of a flea when it is born.
The Mimic Octopus can impersonate up to 15 marine species, including Sea Snakes, Stingrays, Lionfishes, and Jellyfishes.
Octopus wrestling was a popular sport in the 1960s. A diver would fight an octopus in shallow water and drag it to the surface.
Octopuses are eaten alive in Korea.
It’s illegal in many countries to perform surgery on an octopus without anesthesia due to their intelligence.
An Octopus doesn’t have 8 arms but 6 arms and 2 legs.
The Blue-ringed octopus is one of the world’s most venomous marine animals: it can kill you in one bite, there is no antivenom.
Despite their walnut-sized brain, octopuses are highly intelligent, possibly more so than any other order of invertebrates.
If two octopuses approach each other and display dark colors the encounter is likely to escalate to physical confrontation.
An octopus will eat its own arms if it gets really hungry.