It's true, octopuses have three hearts, one that pumps blood around the body and two more which pump blood through the two gills.
They also have blue blood instead of red, due to having copper rather than iron as their binding mineral.
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Diagram courtesy of Compound Interest.
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Octopus
Non-FictionDid you know that an octopus has 3 hearts? A collection of fun and facts about these amazing creatures.
