Good point myronman. However, raptors don't regurgitate like robins or passerines. Typically, they tear off chunks (legs, wings, heads, etc) and leave it in the nest for the young to tear up for themselves. Believe it or not, that's how young raptors learn to kill and target certain prey species. If one feeds a young raptor processed food, without identity of what it is or where it came from (rabbit, bird, etc) they'll never know or learn to target prey or kill. This is a huge problem with people who rehabilitate young raptors. It's rarely done correctly and the bird ends up starving when released.
You are right though, typically, a raptor will "stash" a kill and eat in a safe place. Lots of times they will return to it for several days and feed up. As much as they are predators, they also scavenge a lot. I had a kestrel that carried mice and snakes on top of roofs and stash them in gutters. Every time I took him out he'd go back to that spot and feed up. I had to stop flying him in the area for at least two weeks when that would happen.