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Which Animal Has 32 Hearts?

Published in Invertebrate Physiology 1 min read

No animal has 32 hearts. This claim is a misconception, often circulated online. While some animals, like octopuses, have multiple hearts (three to be precise – one systemic heart and two branchial hearts), none possess 32. The number 32 is likely a conflation or misunderstanding related to the segmented nature of some animals, or a fictional claim.

Let's examine the information from the provided references:

  • Octopuses: Multiple sources correctly state that octopuses have three hearts, not 32. One heart circulates blood throughout the body, while the other two pump blood through the gills. [Source: Various sources mentioning octopuses having three hearts].

  • Leeches: One source mentions leeches having 32 segments, each potentially containing ganglia (clusters of nerve cells), which could be misinterpreted as "brains." However, leeches do not have 32 brains, let alone 32 hearts. They have a simpler nervous system. [Source: Guardian article on leech farms mentioning 32 segments.]

Therefore, the premise of the question is incorrect. There is no known animal with 32 hearts. The internet is filled with misinformation and fabricated claims, and this is a clear example.

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