World Bird Sanctuary's (WBS) reintroduction program has placed more than 80 captive hatched peregrines back into Missouri's wild, and WBS continues to band chicks produced by up to 5 pairs of wild peregrine falcon parents in the greater St. Louis area each year.

Bands are placed on the chick's leg and are color coded and lettered. Spotters can then visually identify individual birds by observing the band without needing to recapture it. The numbers on the bands are sent to the U.S. Geological Survey, which catalogs the information for future reference.
  
Biologists use banding information to study bird movements and populations. If a bird is found injured, its banding numbers can help identify specific data, like the bird's banding location, age and past reported sightings.