My goose and ducks have been hanging out with the teenager ducks for about a week now... no problems. Sometimes the goose will run the little ones away from the food until everyone else has eaten... but no other aggression. This morning I went out and the teenage ducks have NO feathers on their backs.. RED, raw, bleeding skin over their entire backs, and the goose has a black mustache! I kicked the big ducks and the goose out into the yard, I guess he managed to corner them, and rip the skin off their backs along with all the feathers. i have the little ones isolated, what do you recommend?