My three goslings are coming this Friday (so excited) and I was wondering if geese need mostly grass in their diet or if they will eat feed as well? I don't want the geese bullying the duck for feed when they are bigger than him, but I also don't want the geese to only eat grass. Tips on feed? Geese diets? I'm getting very used to how and what ducks eat, but geese just seem completely different! Thanks