Smithsonian Magazine : Ten Wild Facts About Octopus
TEN FACTS !
Excerpt: Two of the hearts work exclusively to move blood past the animal’s gills, where it releases carbon dioxide and gains oxygen. Then, the third heart circulates that oxygen-rich blood to the organs and muscles, giving them energy. But the latter heart actually stops beating when the octopus swims, explaining the species’ penchant for crawling rather than swimming, which exhausts them.
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