Mules (a cross between a female horse and a male donkey) are typically sterile. From wiki:
quote:
Mules and hinnies have 63 chromosomes, a mixture of the horse's 64 and the donkey's 62. The different structure and number usually prevents the chromosomes from pairing up properly and creating successful embryos, rendering most mules infertile.
Don't know that they've looked at the zonkey's chromosomes yet to determine with certainty whether it's sterile....
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