One of the most mind-blowing facts is that octopuses have three hearts! Two of the hearts pump blood to the gills, where it gets oxygenated, while the third heart pumps it to the rest of the body. What’s even crazier is that when an octopus swims, the heart that delivers blood to the body actually stops beating, which is part of the reason they prefer to crawl rather than swim—they tire easily!
One of the most mind-blowing facts is that octopuses have three hearts! Two of the hearts pump blood to the gills, where it gets oxygenated, while the third heart pumps it to the rest of the body. What’s even crazier is that when an octopus swims, the heart that delivers blood to the body actually stops beating, which is part of the reason they prefer to crawl rather than swim—they tire easily!