Celebrating 30 Years of the Four-Square-Mile Survey
Every year since 1987, U.S. Fish and Wildlife Service (USFWS) personnel across the U.S. Prairie Pothole Region have visited approximately 6,000 wetlands to count waterfowl as part of the Four-Square-Mile Breeding Waterfowl Survey. Since the early days of the USFWS, it has been widely recognized that this region is extremely important in sustaining duck populations.