Are you as intelligent as an octopus?

Octopuses have similar brains to humans.

The eight-limbed molluscs are known for their intelligence as they are able to build dens and use their tentacles as weapons, and they have been recorded solving puzzles in captivity.

Scientists have been able to successfully record their brainwaves by implanting electrodes into freely moving octopuses and have identified several distinct patterns - including some seen in mammals.

Researcher Dr. Tamar Gutnick, of the Okinawa Institute of Science and Technology in Japan, said: "If we want to understand how the brain works, octopuses are the perfect animal to study as a comparison to mammals.

"They have a large brain, an amazingly unique body, and advanced cognitive abilities that have developed completely differently from those of vertebrates."