One of the weirdest facts I know is about octopuses: they have three hearts! Two of the hearts pump blood to the gills, where it picks up oxygen, while the third heart pumps the oxygenated blood to the rest of the body. Interestingly, when an octopus swims, the heart that delivers blood to the body actually stops beating, which is why they prefer to crawl along the ocean floor rather than swim—it takes a lot of energy!
One of the weirdest facts I know is about octopuses: they have three hearts! Two of the hearts pump blood to the gills, where it picks up oxygen, while the third heart pumps the oxygenated blood to the rest of the body. Interestingly, when an octopus swims, the heart that delivers blood to the body actually stops beating, which is why they prefer to crawl along the ocean floor rather than swim—it takes a lot of energy!