Octopuses are fascinating creatures known for their unique anatomy, including having three hearts. Two of these hearts pump blood to the gills, where it picks up oxygen. The third heart then circulates the oxygen-rich blood to the rest of the body. This specialized circulatory system helps octopuses thrive in their underwater environments. When an octopus swims, the heart that delivers blood to the body actually stops beating, which is why they prefer to crawl rather than swim. This adaptation allows them to conserve energy while exploring their surroundings.