How many hearts does an octopus have?

Octopuses are fascinating sea creatures known for their eight arms, ink defense mechanism, and intelligence. When it comes to their anatomy, octopuses have not one, not two, but three hearts. Two of the hearts pump blood to the gills, where oxygen is extracted, while the third heart pumps oxygenated blood throughout the rest of the body. The three hearts work together to ensure that the octopus gets the oxygen it needs to survive. In addition to their unique heart structure, octopuses also have blue blood due to the presence of a copper-rich protein called hemocyanin, which carries oxygen throughout their bodies. Overall, the three hearts of an octopus help make it one of the most fascinating creatures in the ocean.