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Sigma KEE - Mule

马骡

The product of a Male Donkey and a Female Horse. Mules are always sterile.

Relationships
Parents	家畜	Any Animal that is kept by a Human, as a pet, as livestock, for exhibition, etc.
	有蹄哺乳动物	The Class of quadruped Mammals with hooves. Includes horses, cows, sheep, pigs, antelope, etc.