An octopus has three hearts, nine brains, and blue blood. Two hearts pump blood to the gills, while a third circulates it to the rest of the body. The nervous system includes a central brain and a large ganglion at the base of each arm which controls movement.
theterramarproject.org/thedailycatch/an-octopus-has-3-hearts-9-brains-and-blue-blood/
octopus clam
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