Is there any species on this earth who has two hearts?

There are occurrences of two hearts but these are bizarre not natural phenomena. A second heart was grafted into a one-year-old's own weak heart surgically to save her life. Some species have three hearts, not two.

These are cephalods such as the octopus, squid and related life forms. Humans have four chambers to their single heart, but some animals have two chambers and some have three chambers.