Speaking of Falcons, will they scavenge? I saw what I'm pretty sure was a Falcon (or some kind of bird-of-prey, anywho) landing on the shoulder of the interstate the other day as I was passing by, sure looked like it was going after something already-dead.
I saw a hawk do this about a month ago. Swooped right in front of my car, grabbed something out of the median and flew off. It was pretty wild.
Regarding the Fox sound, it sounded like a woman being attacked and screaming. It's freaky. Our fox sounded a bit more human than these: