An Octopus Has 9 Brain, 3 Heart, & Blue Blood

Octopus Brain Facts

An Octopus has 3 hearts, 9 brains, bluish-green blood, and the ability to Regrow its arms if it loses one.

Two hearts pump blood to the gills, while a third circulates it to the rest of the body. One central brain controls its nervous system, and others are eight small brains in each of their eight arms.

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