I've never seen Peregrine falcons on this ranch, but we do have them along the coast and this ranch is within 25 miles of the coast, so could be. What threw me was the absence of the white vertical markings in the sideburn area of the head. Also this bird seemed a bit bigger and stockier than the Peregrines I have seen, but I see lots of variations in pictures of the markings and some of those pictured appear to be built like the one I saw. Could be a peregrine??
Thanks for all the comments.
Regards,
hm