YLL, you're right.
The last part is that most mules are sterile or infertile so they can't reproduce.

At a horse show yesterday there were two mules in the western classes.
One of them must have had an Appaloosa as a mother because it has Appaloosa markings.
I'm not sure if I got a photo of them but I can try again today when I go back there.

Your turn YLL.