A vegetarian one?
We work on lots of wildlife / birds of prey at my practice. I'm pretty sure your friend is a sharp-shinned hawk (they have those characteristic bare legs), and most likely a young (or passage) bird. They are inexperienced and, especially as they start their migration, they do stupid things trying to catch enough food to stay alive (Humm, reminds me of some people I know!) I'd post a picture but I have not figured how to do that as of yet.
drexotic