Squid have three hearts

Caribbean reef squid: Sepioteuthis sepioidea, Cephalopods: Cephalopoda, Invertebrates, Marine Life, Mollusks: Mollusca, copyrighted, marine, night, night dive, ocean, underwater, underwater photo

Squids have three hearts. Two branchial hearts feed blood to the gills and a third systemic heart pumps blood around the body.