I toss fallen pears, apples, watermelon rinds, and there is nothing funnier than watching them "fight" over a bunch of grapes! LOL! Rick does not like apples, carrots, or much anything other than his feed, he's so odd.
I do not hand feed.
Since others mentioned leaves (e.g raspberry), we learned the hard way not to plant roses near the fence. Our mares love to eat roses...flowers, leaves, stems (thorns and all)... down to the ground. Posted via Mobile Device
Mine eat apples & pears but I don't give them anything else
As far as what they eat in the wild - you'd have to equate that with what sort of fruit grows in places where wild horse naturally lived - In the UK that's pretty much going to be blackberries, crab apples, cranberries, elderberries a few others maybe as the type of apples, plums, damsons, pears are cultivated orchard grown fruit trees
Casey loves plums. She was in a pasture next to a few plum trees and I went out one day and she was eating the plums off the tree. She even spit out all the pits! I also have a Marionberry patch in one pasture and it is always a fight to see who gets the berries - the horses, dogs, or humans.
There is only one horse at the barn that likes watermelon. His name is Chico, and he's mutton withered and wide. But I love him :) At the summer camp I helped at we had just eaten watermelon and we didn't want to just throw away the rinds, so we gave them to the horses. No other horse liked them but Chico. The way he ate them, he would make a big mess :) it was adorable