My 2.5 week old muscovy ducklings are pulling out their own feathers. I noticed that their wings were a bit bare and red but now one has obvious patches of white with no feathers right above his wings. I also saw him with a couple feathers in his mouth too . They've got room inside and out and play in the water everyday until they jump out themselves. Is there any explanation for this? Is there anything I can do? Inside they've got pine bedding, could that be bothering them?