Equipped with three hearts, two pump blood to the gills, while the third circulates it to the rest of the body, ensuring efficient oxygenation.
This eel-like creature has four hearts. One main heart pumps blood throughout the body, while three auxiliary hearts assist, particularly in low-oxygen environments.
Like octopuses, squids have three hearts: two branchial hearts move blood through the gills, and one systemic heart circulates it to the body.
- Possessing five pseudo-hearts, earthworms use these muscular vessels to maintain blood flow throughout their segmented bodies.
Similar to their cephalopod relatives, cuttlefish have three hearts, aiding in their complex and highly active lifestyle.
- Leeches have two primary heart-like structures called lateral hearts, which pump blood throughout their bodies.
This jawless fish has a complex circulatory system with multiple auxiliary hearts that support its main heart in pumping blood efficiently.