I went out to the coop this evening and found my black australorp hen, Betty, acting a little strange. She was standing on the outside of the nest box acting like she was unable to get onto the roost bars. So I picked her up to put her on it. When I did she freaked out, like I was going to murder her (she is normally not like that!) and then I felt her underside and realized that she is missing a LOT of feathers. Put her on the roost and went out in the run and there were black feathers everywhere! When I went back in the coop I noticed that she was being pretty aggressive to the other hens, to the point that only one was brave enough to share the roost bar with her. So, she is shedding feathers like crazy and is acting "off" to boot. She is 20 months old and has never molted before... could this explain her behavior? Also, it is going to be very cold tonight, should I go out there and put her flannel chicken saddle on her for a little extra warmth? Edited... I didn't count the months up right, she is 20 months old, not 21.