3 Creatures with more than one Heart?

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The presence of one heart is ingrained into our idea of biology thanks to our own bodies as well as the majority of those we see around us.  But did you know there are a handful of animals with multiple hearts?

1. Octopus/Squid

                   
      These similar creatures are both cephalopods and have three hearts in total, one systematic to go along with two “gill hearts” that force blood to the gills.

2. Earthworms


       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. 

3. Hagfish


       Who knew such a nasty creature could have so many hearts? The hagfish has four of them, one main three-chambered systematic heart and three accessory pumps.

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