You might know by now that there are animals, like the octopus, who have more than one heart. The reason for the multiple hearts is simple – to pump blood to various parts of the body, when one heart cannot handle the job on its own.
A few animals with more than one heart:
- 3 for the octopus.
- 3 for the squid.
- 3 for the cuttlefish.
- 4 for the hagfish.
- 5 for the earthworm.
- 13 for cockroaches!
