One of the cleverest brains in the ocean is found in the huge head of the octopus. If presented with two different shapes, one leading to a food reward, the other to a mild shock, an octopus can learn to select only the 'right' shape. An octopus can also learn to tell objects apart just by how they feel, using the sensitive tactile receptors in its suckers to distinguish not only between a rough and smooth surface, but also between surfaces with different degrees of roughness. Behaving independently, one Octopus learned to tug the stopper out of a bottle to get at a shrimp inside, and others in laboratories have been known to wait until night to raid fish from nearby tanks and return to their own tanks by the next morning.
BRAIN POWER
Octopuses can remember events for several weeks and are remarkable in their ability to solve problems using in sight.
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