Landbird population estimates data and population size estimation for North American bird species, Partners in Flight and Rocky Mountain Bird Observatory.
Monitoring Avian Productivity and Survival (MAPS) data and demographic parameter estimates for North American bird species based on MAPS banding stations, Institute for Bird Populations.
North American Breeding Bird Survey (BBS) long-term count data and abundance estimates for North American bird species, USGS Patuxent Wildlife Research Center.
Drought data NOAA