Welcome to the Partners in Flight Landbird Population Estimates Database.

This web site is intended to:

1. Provide users access to the estimates of landbird populations published in the North American Landbird Conservation Plan (Rich et al. 2004), which were based mainly on Breeding Bird Survey data from the 1990s,
2. Allow users to view and download estimates for landbird populations at a variety of geographic scales, and
3. Provide transparent access to the methodologies, assumptions, data sources, and species-specific correction factors used by Partners in Flight to create these estimates.

Complete details and guidelines for using this resource can be found in the “Guide to the PIF Population Estimation Database”. The current version of this web site and the underlying database corresponds with continental population estimates provided in Rich et al. (2004), and with stepped-down estimates for each U.S. state provided by Rosenberg (2004). Partners in Flight is actively working to revise these population estimates and is seeking input and relevant data from throughout the bird-conservation community.

On this site we provide estimates at a continental scale (including global or rangewide population estimates for North American species), population estimates for Bird Conservation Regions, estimates for individual states and provinces, and estimates for geopolitical units where Bird Conservation Regions overlap with states and provinces. In each case, we offer a simplified Excel table with estimates for species or regions of interest, or a user can download a more complex table with all the pertinent information behind these estimates, including data sources, correction factors, and data-quality flags. Note that for a small number of landbirds whose continental estimates were not based on Breeding Bird Survey data, estimates are provided only at the continental scale. To begin querying the database, click here.