Every once in a while, you might find a lost little fawn. These can be nursed back to health by feeding them with randomly selected products at certain intervals. After each feeding you'll see a timer over the fawns head showing how long it'll be until you can feed it again. Since a young fawn like that needs frequent feedings, you'll only have a limited amount of time to get the small deer the food it needs.
If you manage to feed it enough times, you'll get a big reward of experience points. You'll be able to give it a name and return it to the forest. It won't give you any further rewards, but you can sometimes spot it merrily prancing around in the woods.