Mule's foal fools genetics with “impossible” birth – The Denver Post
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Befuddling Birth: The Case of the Mule's Foal : NPR
How do donkeys look like the mule? - Quora
Befuddling Birth: The Case of the Mule's Foal : NPR
A male mule is called a john. A... - Black Cat Mules & More | Facebook
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Mules can't reproduce. Here's the biological explanation why. | Belleville News-Democrat
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