What parent primarily contributes the foundation of a mule's hardiness and thriftiness?

Answer

The jack (male donkey)

The mule inherits its famed hardiness and efficiency from the donkey parent, specifically the male donkey known as a jack, which evolved to thrive in arid, sparse environments.

What parent primarily contributes the foundation of a mule's hardiness and thriftiness?
dietanimalComparisonhorsemule