How come a horse and a donkey reproduce together and make a mule however a mule and a mule can not reproduce more

How come a horse and a donkey reproduce together and make a mule however a mule and a mule can not reproduce more mules??????

Posted on June 15, 2015 by in Question. Comments Off on How come a horse and a donkey reproduce together and make a mule however a mule and a mule can not reproduce more

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