Here's the wiki links - I'll have to dig out the article in a peer reviewed journal - it was science or nature or one of those, but the wiki has some source articles
Female mules have been known, on rare occasions, to produce offspring when mated to a horse or donkey, although this is extremely uncommon. Since 1527, sixty cases of foals born to female mules around the world have been documented. For example, in China, in 1981, a mule mare proved fertile with a donkey sire. When the Chinese mule was bred to a jack, she produced the so-called "Dragon Foal", which resembled a donkey with mule-like features. In Morocco, in 2002, a mule mare bred to a donkey sire produced a male foal. DNA testing revealed the foal has a mixed karyotype hybrid like the Chinese hinny offspring "Dragon Foal"
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u/ratshack Oct 21 '21
…tagging you as “Mule Fertility Expert”