Small miracle today. The bird is gone.
Either a cat took it, or it wasn't really dead.
If it was a cat I expect some feathers or something but the place was clean.
Also I said small bird, but the bird was fairly sized, a grown Starling.
For a cat actually slightly too big to pick up in the mouth, plus then the cat has to jump the 1,8m fence.
But I found no sign of ripped feathers or blood.
Bird of prey is also possible, but then there would be feathers al over the place as they just start eating on the spot.
So hopefully the bird regained consiousness and managed to fly away.
Yesterday it looked good as dead, out cold, bleeding from the beak and leaking stomach fluid.
I put it in the yard so it could die in peace, before I put it in the ground.
Glad I didn't bury it right away.