hadt thought of a sparrow hawk, I hardly see anything other than buzzards around here. Would a owl do it, got barn, tawny and little all around.
I'm going for badger. Looks like a classic case to me. They turn their prey inside out just like that. I've found they do it with hedgehogs very well, almost like a human did it.
Removing the head is a typical Sparrowhawk trait. Owls eat their prey whole as a general rule and wouldn't take a pigeon out. Buzzards are big birds, so such a small morsel wouldn't be worth the effort of a kill. Spawks just love to nip the bonce off.
Peregrines prey quite often have no head, especially pigeons - knocked off on impact.
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No peregrines around here, sparrow hawk sound most likely