The Prairie Falcon (Falco mexicanus) is listed as a Sensitive Species in Alberta. Alberta supports the bulk of the Canadian population with an estimated 200-250 pairs (Paton 2002). Smaller numbers nest in Saskatchewan; they are
close to extirpation in British Columbia (M. Chutter pers.comm.). Their dependence on a limited number of river cliffs for nesting and Richardson’s Ground Squirrels Spermophilus richardsonii) as prey make them vulnerable to cumulative changes in an endangered prairie landscape.
The poster shows demonstrates the changes in prairie falcon populations over time in Western Canada.