Perhaps two of the most interesting discoveries about octopuses, though, is that they have three hearts and nine brains.

Octopuses have blue blood, three hearts and a doughnut-shaped brain. But these aren’t even the most unusual things about them! Known for their otherworldly look and remarkable intelligence, octopuses ...

Hemocyanin is known to be less efficient at carrying oxygen, and so, the octopus needs two hearts to send blood to its gills and one heart to pump it to its body. Nine brains for effective control ...

At the same time, octopuses are as alien as any extraterrestrial you might dream up. For starters, they have three hearts and blue blood. When feeling under threat, they squirt a cloud of ink and ...