Octopuses have three hearts: two pump blood to the gills, while the third pumps it to the rest of the body. The heart pumping to the body stops beating when the octopus swims.
Sources
- https://www.scienceabc.com/nature/animals/why-do-octopuses-have-three-hearts (scienceabc.com)
- https://www.nhm.ac.uk/discover/octopuses-keep-surprising-us-here-are-eight-examples-how.html (nhm.ac.uk)
- https://www.britannica.com/science/How-Many-Hearts-Does-an-Octopus-Have (britannica.com)
- https://www.sheddaquarium.org/stories/eight-strange-and-wonderful-facts-about-octopuses (sheddaquarium.org)
- https://spacedaily.com/t-octopuses-have-three-hearts-and-blue-blood-that-carries-oxygen-using-a-copper-based-protein-rather-than-iron-and-because-the-heart-that-supplies-the-body-stops-beating-whenever-they-swim-many-bottom/ (spacedaily.com)
- https://www.smithsonianmag.com/science-nature/ten-wild-facts-about-octopuses-they-have-three-hearts-big-brains-and-blue-blood-7625828/ (smithsonianmag.com)
- https://octonation.com/how-many-hearts-does-an-octopus-have/ (octonation.com)
- https://www.discoverwildlife.com/animal-facts/marine-animals/why-octopuses-have-three-hearts-when-three-are-better-than-one (discoverwildlife.com)
- https://scienceblog.com/t-octopus-three-hearts-jet-swimming-systemic-heart-stops/ (scienceblog.com)
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