Of course I didn't have my camera the other day when I was at the barn. Cute and funny things always happen when my camera is in the house.
I was walking by the pregnant ewe corral and saw one of the Muscovy ducks close to a ewe's mouth. The ewe had bits of grain on her chin and the duck was gently reaching up to clean them off (and eat them). The ewe seemed perfectly content to have the duck do this and so the duck continued until she felt the task was finished.
I've seen chickens get rides on the backs of ewes but that was the first time I've seen one of the feathered friends do something like that.