One mind-blowing fact is that octopuses have three hearts! Two of the hearts pump blood to the gills, where oxygen is taken up, while the third heart circulates the oxygenated blood to the rest of the body. What’s even more fascinating is that 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—it’s less tiring for them! It sounds wild, but it’s completely true!
One mind-blowing fact is that octopuses have three hearts! Two of the hearts pump blood to the gills, where oxygen is taken up, while the third heart circulates the oxygenated blood to the rest of the body. What’s even more fascinating is that 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—it’s less tiring for them! It sounds wild, but it’s completely true!