No. 9 in our list of world's smartest animals is the octopus, one of the smartest creatures in the sea. This animal is still ...

Meet the Giant Pacific Octopus, perhaps the smartest of all invertebrates and the bane of many a crab fisherman. Boasting an enormous brain, this voracious poacher can adopt a number of creative ...

This was proven experimentally in 2011 when researchers tested whether an octopus could learn to guide one of its arms through a maze to reach food. The maze was designed so that the arm would have to ...