Had an issue with snakes in the sleeping quarters I thought. Had lost 8 one month old chicks. All of the flock refused to go in at night and were sleeping as far as 300 ft from the pen. Then the Hawks and Owls came. Took the flock down two thirds until problem was resolved. After treating the nesting and sleeping area I began to put them back in at night, against their wishes for sure! No problems for two nights, picked up 5 new ones yesterday and go out this morning to let them out and I'm down 2 birds. One adult hen, nothing left but feathers, one 5 month old rooster. Head and neck mutilated. This flock can free range at will, stay mostly in a 50 x 30 old dog pen with chain link. Nesting area was never closed in, one side open for 1 year before problems began. Last few nights it's been closed expect maybe 6" in space at the top of sheet metal door. No digging evidence. I live in heavily wooded acreage, chicken pen is very close to the house and there is 25 feet minimum space along fence line that is cleared. There is one young kitten that stays with the flock but has never expressed interest in them. Any one, any help?