I noticed that one of my Silkies and one of my Cochins had a bald butt. Then a few days later I have noticed that a few more have completly bald butts. What could be causing this? Could it be lice/mites? Is it a molt? Could it be someone thats being a feather plucker? I have seen one that will pluck a feathers if it is sticking up funny. Im still fairly new to chickens, I havn't even had them for a year so I'm not really sure. Thanks