We are new to chickens this year, and have about 50 chicks. The coop is very secure, so that I am sure no predator larger than a rat or a snake could get in or out during the day, and nothing at all at night, but several of our chicks have gone missing, including some that are over 6 weeks old, so too big to have escaped. We did find a few decapitated chicks last week, so we assumed it was a rat after reading several predator threads on BYC, and we put out poison and haven't lost any more since then. Could rats have removed whole, large chicks without a trace???