128 
THE WILSON JOURNAL OF ORNITHOLOGY • Vo/. 124. No. I. March 2012 
0 200 km 
YNP Yellowstone National Park | | -\ 
FIG. 1. Distribution of nest-sites of Peregrine Falcons in the study area. The known range of Peregrine Falcons m 
Colorado exceeded the distribution of pairs wc studied. 
where peregrines had been seen by casual obser 
to ascertain if nesting pairs were increasing. 
ed ^"'T'~ The IJSFWS '“"domly sel 
an . I . s,oncal sites in Colorado. Wyom 
and Montana as a part of „ national monito 
program in 2(KB, 2006. and 2009 (USDI M 
We included data from ,5 each in Wyom, ng 
Montana, and 12 in Colorado of the 5 ' |L 
selected. Our total sample included many sites ny. 
designated by the USFWS (total sites: D ’ 
2005, 177 in 2006, 167 in 2007, 149 in 2008, and 
202 in 2009). We accumulated 852 site-years. 
of which included sites selected by the US 
and 770 that were not part of that program- 
