This is the second time I've had this happen with ducklings in the past ~month. When they start getting their fingertip flight feathers in, someone ends up getting their feather tips but off so badly that they bleed. Both times it has been a Cayuga duckling that got his feathers bit off. They're almost all Cayugas or mixes so it doesn't seem like it's a coloring issue. They're all close to the same age. I have 5 the same age as Stu, he duckling who got his "fingers" bit off this morning so I don't understand why Stu got singled out. I don't see the wings turning out at all like they would with angel wing. Not sure if angel wing tempts others to nibble at feathers anyway. Poor Stu's wing tip was bleeding so much that it matted his body feathers below his wing down. I cleaned him and put styptic powder on the bleeding feather tips to get them to stop bleeding. I have him separated from his siblings with a bit of fence now because I didn't want anyone to hurt him more. When this happened with the other duck, Desmond, the meanies ended up biting the wing tip feathers off both of his wings. His wings look fine now. I just don't understand why they'd single one out and chew his finger feathers off. Any ideas?