About 5:30 am I heard my hens fussing...not frantic cackles but definitely upset. They roost in a covered 6X12x6 chain link pen. When I went out I saw quite a number of feathers in and out of the pen and hens were all by the gate...I let them out and when one ruffled her feathers on my porch she dropped a bunch more feathers...it is not time for moulting...I wonder if the get scared do they drop feathers? Only thing I can figure is something must have startled them off of their roost as I dont imagine anything significant can get in. We do have rats but they have never bothered the hens before and I remove access to food and water to discourage their visits anyway.