Kestrel and Robin
I had spent many hours in a hide near a Kestrel box at a nearby farm. Finally patience paid off and one late afternoon the female came in clearly exhausted, perching with one talon while barely hanging on to this headless robin with the other. After a few moments of rest, she took off for the nest only to return to the perch with her prey to partially dismember it presumably to get rid of non-essential portions of the carcass.