Octopuses Have Three Hearts and Blue Blood

Two hearts pump blood through the gills, while a third circulates it to the rest of the body. Their copper-based hemocyanin gives their blood a distinctive blue hue, unlike the iron-based hemoglobin in human blood.

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https://en.wikipedia.org/wiki/Octopus

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Published: March 24, 2026
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Biology Ocean Animals Octopus Marine Life Anatomy Blood Cephalopod

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