One interesting and not so well-known fact is that octopuses have three hearts. Two of these hearts pump blood to the gills, where it picks up oxygen, 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 one reason they prefer crawling to swimming!
One interesting and not so well-known fact is that octopuses have three hearts. Two of these hearts pump blood to the gills, where it picks up oxygen, 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 one reason they prefer crawling to swimming!