We have two fully enclosed chicken coops with net tops and fully board bottoms. One coop held our mature layers and the smaller coop held our 3 month old layers. Last night around 4 am I heard something outside and sent my husband and dog out and something had already killed 2 mature layers and almost the whole pen of smaller layers (13), including my daughters fancy 4-H bird. Needless to say we are devastated, but has anyone else had this happen? We haven't lost any birds until last night, killing 15. Something killed them but didn't eat them. It looks like 2 birds something tried to pull thru the fence but the rest were just laying dead on the ground. What can do this? We are in Michigan and some people are saying weasels can fit thru the fence and kill. I've read on here owls, but the birds weren't eaten. Same with posts I've seen about raccoons but they aren't weren't mangled. HELP US! What is this?