Tonight I came home a little after dark and found three out of four of my Silkies dead. All of them had no apparent marks on them but all were found with their heads wedged (stuffed?) under the coop. Two were together and the third was on the other side of the coop. Does this sound like weasel behavior? Something else? Sickness? We have other birds but these guys were the "pets" of our flock and it was so shocking to find so many dead.