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 ...

Optical illusions are a great way to test your observation skills. We have a challenging puzzle for you. In this sea-themed ...

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 ...