I went to the coop this morning and everything seemed normal. We opened the doors and my brother found his Mottled Cochin, Ellie, dead on the floor, headless and missing a bunch of feathers. There were some feathers on the floor but not enough to cover Ellie's body. She had what looked like bite marks in 2 places but nothing could get in the coop except for small snakes or something else small. The other chickens didn't seem too bothered by this. We're reinforcing our coop today but little Ellie will never be replaced. She was the kindest and most social out of all of our chickens. We're going to miss her so much. RIP Ellie. Any idea what could've done it?