Is there any set of circumstances in which having 3 hearts in an organism would be beneficial in a species?

As a school project, I am designing an extraterrestrial animal, and I would like to include a multiple-hearted mammal-like organism. Is there any set of circumstances in which having 3 hearts would be beneficial to a mammal-like creature, such as the hematocrit or possibly the complexity of the organism?

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Is there any set of circumstances in which having 3 hearts in an organism would be beneficial in a species?

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