I have 4 khaki campbells ducklings that are 3 weeks old as of yesterday. One of them has this fascination with plucking the new feathers coming in on the other 3 and then eating them. It is plucking the whole quill part and all and since they are first coming in, there is some blood and loud peeping involved. They are in a 50 gallon trough and have plenty of room, plus we let them swim in the bathtub almost daily, but it is doing it to the others in there as well. I clean them out as often as possible, a minimum of twice daily, they are dry and happy otherwise. I am using the milk jug inside of another tub within the large trough they are in so it really minimizes the mess. They have a heat lamp yet for when they need it. Any ideas as to why the one is doing this? I have never had any problems like this with my chickens so I am at a loss as to what to do.