Which animal has 3 hearts, 9 brains and blue blood?
Which animal has 3 hearts, 9 brains and blue blood? Octopus Octopuses have 3 hearts, because two pump blood to the gills and a larger heart circulates blood to the rest of the body. Octopuses have 9 brains because, in addition to the central brain, each of 8 arms has a mini-brain that allows it to act independently. Octopuses have blue blood because they have adapted to cold, low oxygen water by using hemocyanin, a copper rich protein. We know that octopuses are intelligent, because they like to play and use tools – but we have no way of relating to what it would be like to have 9 brains. The central brain is a doughnut shape that forms a ring around the esophagus, so when an octopus swallows, its food must ‘pass through’ the brain! What a concept! Food for thought…? The most interesting thing is that they have a mini brain in each arm. This adds up to a lot of distributed brain power. Since each arm has a mini brain, the central brain just sends a higher-level signal to th...