2. Octopuses Have Three Hearts

An octopus has three hearts: two pump blood to the gills, while the third pumps it to the rest of the body. Additionally, their blood is blue because it contains a copper-based molecule called hemocyanin, which is more efficient at transporting oxygen in cold, low-oxygen environments.

The unique circulatory system of octopuses is fascinating! Having three hearts and blue blood allows them to thrive in challenging underwater environments, showcasing the incredible adaptations of marine life.