We have two 1.5 month old ducklings that are kept indoors until it's a bit warmer an they can be socialized with our other 2 ducks. Meatloaf (our runner/mallard duckling) has been biting, pulling at, and eating the feathers of his partner Bill (Cayuga duckling). I have no idea what to do, how to make him stop, or why he's doing it! They live (in what I thought ) was a pretty sizable house, but maybe it's too small? Not entertained enough? Missing some sort of nutrient? They eat great waterfowl grower feed, I give them treats full of protein, and feel like things have been peaceful until a few days ago. Any ideas? Here's their house..is it too small?