Most of a Peregrine, chomping on something, about 1 foot away from my feet, for several minutes. In fact it’s still there.
To explain, I work on the 15th floor of a 16 floor building and we are regularly privileged to see a peregrine, sometimes two, swooping round the building. At the moment it is perched below my window and I can only just see it by pressing my forehead against the window and looking down, seeing its body lengthwise, its head busily working away at a dead something, probably a pigeon. It was the flying feathers that alerted me to it. Thaty was 10 minutes ago and it is still there.