We have our remaining 4 chicks and mother hen in what seems to us to be a very secure coop! For the last several days we have gone out and found two chicks missing..no sign of them anywhere?? We had 6 chicks. We are heart sick..we don't know what in the world could be happening...Is it possible a snake if crawling under part of the coop and getting in? Would they only get one chick at a time over two or three days? Help please!