Which animal has 2 hearts?

Thinkstock. While it is not technically a “heart,” the aortic arch of the earthworm performs a similar function and is commonly referred to as one for the sake of simplicity. An earthworm has five arches/hearts that are segmented and pump blood throughout its body. read more

The hagfish has four of them, one main three-chambered systematic heart and three accessory pumps. BONUS: Humans. Yes, there are seriously humans with more than one heart. read more

Octopus / squids have one primary heart to pump the oxygenated blood throughout their body and they have two more operational hearts to pump blood to their gills. 2. Earthworms. An earthworm has no exact heart but it has five arches/hearts that are segmented and pump blood throughout the body. I had seen that someone told fish have two hearts. read more

Crocodiles are the one reptilian exception, as they have 4 chambers (2 atria, 2 ventricles). Birds and mammals have 4 chambers (2 atria and 2 ventricles). Differences between the hearts: The fish heart (figure 1a) is much different than the amphibian/reptile/bird/mammal heart (figures 1b and c). read more