You can usually visit an animal you have adopted.
I adore donkeys too lou, which is strange becasue I don't much care for horses but donkeys seem different somehow.
So do you mean that by adopting it you won't get to see it in person?You can visit the donkey sanctuary. There's one in Ireland.
A mule is a cross between a male donkey and a female horse.
And although you haven't asked, the website I found said that when you cross a female donkey and a male horse you get a hinney.
The site also said that mules and hinneys are sterile hybrids, which means they cannot reproduce. A tiny percentage of the females have had foals but this is considered a freak genetic accident.
How awful is that? It just goes to show that mother nature should not be messed with.