5. The Mimic Octopus
This octopus is clever because it can match the colors around it. It is like the chameleon except that it is far faster at changing and far better at it too. This is a creature that can change its color in seconds so that there are few situations where this octopus cannot fit in. It will even mimic plants and animals to fool its predators and prey. It is one of the most intelligent creatures in the ocean.