I enjoyed watching a migrating flock of  about 50 White-throated Swifts engaged in frenzied breeding along the Arkansas River near the Florence River Park. I have observed similar feeding flocks at this location in previous years as they make their way to locations further west with cliffs.

Fyi-these pics are good enough quality to be enlarged for better viewing, just click on each pic.
I wonder if some of these are on their way to the Royal Gorge just west of Canon City and only 20-25 years west of this location.  SeEtta