!Possum lover alert!
   Okay, so possums do not like confrontation and will partially shut down their internal organs to play dead. Some will make a big snapping snarling show to try and get you to leave them alone, but they really just want be left in peace and not fight anything. Opossums, unfortunately, will occasionally kill a chicken but usually they are just blamed for eating the carcass. They are rarely a problem but one every now and then gets a taste for fresh chicken and gives all possums a bad rap.
 It probably was living with you for a while.
 The possums with darker fur tend to be more aggressive and ones with lighter fur tend to be more docile out here. So I’d suspect it just came to you to get warm and fed, sometimes they will sleep in the coop for heat, not to eat your gals.
   By the way, they never stop growing until they die at 2-3 years. They are also closely related to the mongoose and can eat venomous snakes with no issues.