Interesting research/website with maps
There is a group conducting research on Ferruginous Hawks including telemetry. They have banded and placed radio-collars on several hawks from the Comanche National Grasslands in SE Colorado and found some interesting information on post breeding dispersal/fall movement as well as migration to wintering sites.
You can read about this research at FerruginousHawk.org. And you can even watch the movement of selected radio-collared birds (this is too cool) here (click on a bird on the right panel and watch it's movements on the map).
SeEtta