Octopus has how many hearts? Two of the hearts are located at the base of the gills and pump blood through each of the two gills, while the third heart is located near the esophagus and is responsible for circulating blood throughout the body.

Octopuses have three hearts because they have a unique circulatory system that is adapted to their needs. Their two gill hearts pump blood to the gills where oxygen is extracted, while their systemic heart pumps oxygenated blood throughout the rest of their body.

This is necessary because octopuses have a highly efficient respiratory system that extracts oxygen from water, but this system is not as effective at delivering oxygen to the rest of the body as a mammalian circulatory system would be. By having three hearts, octopuses are able to efficiently deliver oxygen to all of their organs and tissues, allowing them to survive and thrive in their marine environment.