I had this happen with my ducks!, right out of my chain-link kennel, the door was closed and the dog couldnt get in and the only way anything could get in is either climbing in and climbing back out with them or dive in and take them out (like a hawk, but very unlikely because they did it to all my ducks, all 4) some had there heads bit off and others no sign of injure like they got beat to death and had internal injures. But before this all happened my first flock (coop burned down, have new flock now) had gotten out of the coop and I was going threw the woods to get them back in, one got picked up by a hawk and it bit its head right off and dropped it not to far from me.
The only thing I can fit it with is hawk
The only thing I can fit it with is hawk