Hi Tweeters:
A short, but very interesting article about Peregrine Falcons is in the Wall St. Journal, July 18-19, 2015.
http://www.wsj.com/articles/peregrine-falcons-make-comeback-in-illinois-1437164918
Good research into numbers of nesting pairs in the US, Canada, Illinois, Chicago. Check out where the birds prefer to nest.
Yours, Carol Schulz
Des Moines