Befuddling Birth: The Case of the Mule's Foal : NPR
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Best of the burden: Smokies mules make backcountry operations possible
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TBT: 6 Truths About Owning Mules | HORSE NATION
Why Can't Mules Have Babies? - YouTube
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Mule's foal fools genetics with “impossible” birth – The Denver Post
Mules Animal – All About These Reliable Pack Animals!
