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Octopus
Octopuses have the strangest of hearts! Unlike other animals, octopuses have three hearts that pump blue, copper-rich blood throughout their bodies. The main heart pumps blood throughout the body, while the other two pump blood through the gills. The blood is copper-rich due to the presence of copper-based proteins that help carry oxygen. The hearts have a complex network of valves and vessels, which allow them to pump more oxygen-rich blood to their vital organs.
