Mules are generally known to have fertility problem. How often do mules give birth to a healthy offspring?

usually
about 50% chance
very rarely
never
Mules are considered infertile, but there have been more than 60 documented cases of foals born to female mules around the world (some of them were even DNA-tested to verify the motherhood). There are no recorded cases of fertile mule stallions.
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Answers by country

usually
about 50% chance
very rarely
never
answers
flagIndia
8%
14%
53%
23%
169
flagthe Philippines
0%
31%
50%
18%
16
flagAustralia
8%
12%
45%
33%
24
flagthe United States
3%
27%
42%
24%
318
flagGreece
0%
0%
41%
58%
12
flagPoland
5%
21%
39%
32%
11662
flagPakistan
5%
15%
36%
42%
19
flagthe United Kingdom
8%
24%
34%
30%
99
flagCanada
6%
46%
33%
6%
15
flagGermany
12%
25%
20%
38%
54