Octopus are an unusual amphibian. They have two sets of eyes, four arms and three hearts. Two of the hearts pump blood to the gills and the third heart pumps blood through the body. You can find more information here: http://en.wikipedia.org/wiki/Octopus
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How Many Hearts Does an Octopus Have
The common octopus (Octopus vulgaris) is the most studied of all octopus species.
O. vulgaris is considered cosmopolitan. Global in its range in the eastern Atlantic extends from the Mediterranean Sea...