> A mule cannot [breed]. That's almost always true, but isn't an absolute. There are documented cases of fertile mare mules: https://en.wikipedia.org/wiki/Mul

> A mule cannot [breed]. That's almost always true, but isn't an absolute. There are documented cases of fertile mare mules: https://en.wikipedia.org/wiki/Mule#Fertility https://en.wikipedia.org/wiki/Mule#Fertility