The identity doesn't really matter much. With a trail of feathers you know it's a land animal that is scaling the fence. The first place to start is to make it so an animal can't scale the fence. There are perhaps many ways to accomplish this. I would opt for a quick and simple plan of action which would include a few strands of poly wire or poly tape attached a few inches on outside of run and connected to a charger. Two strands of electric, one low and one high will stop an animal from climbing a fence. If your fence does not have a dig proof apron then put the first electric wire about 4 inches above ground. Problem solved.
