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 Unnatural Animals Live In Unnatural Environment -The Great Cuttlefish   Blogs,Science & Technology,Research 1. Cuttlefish have not one, not two, but three hearts! Two hearts are used to pump blood to the cuttlefish's large gills, and the third heart is used to circulate oxygenated blood to the rest of the body. Speaking of cuttlefish blood, even that's interesting. According to New World Encyclopedia, "The blood of a cuttlefish is an unusual shade of green-blue because it uses the copper-containing protein hemocyanin to carry oxygen instead of the red iron-containing protein hemoglobin that is found in mammals." 2. In an effort to hide from predators, cuttlefish can mimic the shape and texture of objects around them. Their close relative, the octopus, is also able to do this. Cuttlefish accomplish this texture change by extending or retracting tiny bumps called papillae located across their bodies, and thus better match sand, bumpy rocks or other surfaces where t...