A small correction:
"USFWS US Fish and Wildlife Service Issues the sequential numeric bands used in bird banding. On peregrine falcons, the band color often indicates the region the bird was banded"
Actually, the USFWS band (placed on the bird's right leg) is always silver. The colored band with larger, more readable numbers and letters (on the left leg) is the one which can indicate the region in which the bird was banded.
Marcia L.
Have they stopped using the purple USFWS bands in the Midwest?