Octopuses given Rubik’s Cubes to find out if they have a favourite tentacle

Marine experts have given 25 octopuses a Rubik's Cube each in a study aimed at easing their stress levels in captivity.

Scientists believe the intelligent sea creatures have a preferred arm out of eight that they use to feed and investigate with.

They are now testing this theory with a month-long observation project in which the octopuses will be given food and toys to play with.

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