My chickens are 8 weeks old been outside for 3 weeks. I am wondering if it is normal to see many loose feathers in the coop and run. They are not fighting, I think they are just losing them, no one looks like they have any bald spots. Yesterday I observed and saw some falling off just from their preening. Is this normal? It's not just one bird that is losing feathers, I noticed black feathers because they stand out, but looking more closely there are plenty of lighter color feathers laying around also.