I just went out there to check for holes in the coop found a couple of holes a snake could get into. They have a gallon waterer on a wood palet. They can't stick their heads out and I'm not sure how big the holes are but they seem to small for a snake to get into. The coop is attached to a shed...
One day I went out to my coop consisting of 2 Australorps, 4 silkies, and 1 mixed chicken, one of the Australorps was acting weird so we separated her and treated her with Corid, 5 days after she wasn't showing any symptoms so we put her back outside and she died the next day her head and neck...