Octopuses have three hearts, and two of them stop beating when they swim. This is why they prefer to crawl rather than swim—it conserves energy!
Here's something most people don’t know: Octopuses have three hearts, and two of them stop beating when they swim.
Two hearts pump blood to the gills, while the third pumps it to the rest of the body. When an octopus swims, the heart that delivers blood to the body temporarily stops—which is why they prefer crawling over swimming; it’s less exhausting!
Also, their blood is blue due to copper-based hemocyanin, which is more efficient than iron-based hemoglobin in cold, low-oxygen environments like the deep sea.
Octopuses have three hearts—two pump blood to the gills, while the third sends it to the rest of the body. Interestingly, the heart that delivers blood to the body stops beating when the octopus swims, which is why they prefer crawling to conserving energy.