We’re in Spokane, WA!
We have 12-22 week old hens.
I have checked for external parasites multiple times and never find anything. Which is good!
I am beginning to think it’s juvenile molting. I’ve been watching them more closing and am not really seeing any behavior causing it.
Thank you!!
OK.
They are not hens, they're pullets. They'll be hens when they turn a year old or, at least, are laying full-sized eggs rather than the small eggs that pullets start with.

The older ones should be done with all their juvenile molts, but the younger ones are definitely of the age to be replacing feathers as they grow so rapidly (my grow-out area often looks like bomb went off in a pillow factory).
Photos?
Just because we LOVE chicken photos around here.
