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 was wet. The day after we separated the Australorp I found two silkies were dead with wet heads and necks and another silkie looked like the side of it's face was attacked and died later in the day. Since there was only one silkie left I decided to put him out with the rest of the chickens in my yard but, today I came home and we found him dead with a wet face and neck to. I think it's a snake but does anyone know what else could be causing this?