Did anyone have problems with muskrats? They dug through the ground and got into our coop an killed all but one chicken. We put strong wire mesh all in the floor of the coop an secured it well. Today we found out last chicken decapitated in the coop. We have no idea how it got it! There was no hole! Our coop is wood frame with chicken wire as walls and then a loft in the roof where it's closed in except for the ramp they walk up. We ordered more chickens but are worried. Help!