Chicago started using Peregrine Falcons to combat pigeons quite a while back. The falcons are federally protected and apparently, the effort was successful. ht

Chicago started using Peregrine Falcons to combat pigeons quite a while back. The falcons are federally protected and apparently, the effort was successful. https://www.fieldmuseum.org/science/special-projects/illinois-peregrines/peregrine-frequently-asked-questions https://www.fieldmuseum.org/science/special-projects/illinoi...