North American Breeding Bird Survey Results and Analysis
Results are available at survey-wide, country, state or province, Bird Conservation region, and individual survey route (US only). For all scales, annual indices of abundance are displayed along with population trend estimates. Maps provide visualizations of population change via colors (red color indicates significant decline, yellow is nonsignificant decline, light blue is nonsignificant increase and dark blue is significant increase). For the analysis of 2019 data, results for each species are based on one of 4 alternative models based on a model selection procedure described in Link et al. (2020).
Citation:
Sauer, J. R., D. K. Niven, J. E. Hines, D. J. Ziolkowski, Jr, K. L. Pardieck, J. E. Fallon, and W. A. Link. 2019. The North American Breeding Bird Survey, Results and Analysis 1966 - 2019. Version 2.07.2019 USGS Patuxent Wildlife Research Center, Laurel, MD
