What animal have 5 heart?

Earthworm has five hearts=

Earthworm hearts in action click on the link below =

http://academic.scranton.edu/faculty/can...

Colored diagrams on the link below = click onit =

http://cache.eb.com/eb/image?id=72114&re...

http://www.nrwmg.vic.gov.au/images/ana1....