SOLVED: Mules are the offspring of the mating of a horse and a donkey. Mules are unable to reproduce. A horse has a total of 64 chromosomes, whereas donkeys have 62 chromosomes.
HYBRID EQUINES - MULES, MOLLIES AND HINNIES
Befuddling Birth: The Case of the Mule's Foal : NPR
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Hybrid Infertility: Why Can't Mules Reproduce?
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Are Mules Sterile? - Ned Hardy
Hybrid Infertility: Why Can't Mules Reproduce?
Befuddling Birth: The Case of the Mule's Foal : NPR
Mule Facts, Worksheets, Habitat, Characteristics & Diet For Kids