Welcome to the Partners in Flight (PIF) databases

The PIF Databases were developed with the input of dozens of ornithological experts from 10 countries. They are managed by Bird Conservancy of the Rockies and form the scientific basis for the 2016 PIF Landbird Conservation Plan, other bird conservation plans, and State of the Birds Reports.
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Use the buttons below to access the databases:

  • The Avian Conservation Assessment Database provides conservation assessment data and rankings for all North American bird species at multiple geographic scales.
  • The Population Estimates Databases provides estimates of breeding population size at multiple scales for U.S. and Canadian landbirds only.

Database News:

September 4, 2020:

The Avian Conservation Assessment Database and Population Estimates websites are being rebuilt to improve ease of use and functionality. The data currently displayed in the online tables reflects the 2019 updates to the data, but not the 2020 data. The 2020 data is available here in downloadable form:

Current versions of the Avian Conservation Assessment Database and Population Handbooks are available here:

Version 2020 of the ACAD was also updated taxonomically to the 60th supplement, and extinct and extirpated species removed. The Mig Status field was corrected. This version also includes many changes to PS-g and PT-c and associated fields (including restoring the Pop Change field and adding a PopYr field) based on incorporation of many of the data sources used in Rosenberg et al. 2019 (Science). At the regional level, a small number of northern breeders were changed from PT-r = 3 for unknown trend to a more informative score based on expanded BBS. The Intro to BCR field was dropped due to inconsistencies. The field %WH_UsCa was added, and the complementary field %Breeding Pop in US & Canada was corrected and in some cases nulled where previous percentages appeared questionable. TB-r scores based on TB-c were updated to reflect changes to TB-c. TB-r was copied into TN-r for residents of Guatemala and Costa Rica missing TN-r. The action code PR was corrected. Truncated and missing comments were restored and erroneous comments deleted. The ACAD Handbook Version 2020 was updated to reflect these changes.



June 17, 2020:

Version 3.1 of the Population Estimates Database Handbook incorporates minor improvements in text clarity over the previous 3.0 version, updates citations in the Literature Cited, and documents changes in sources for a few species. The content of the Population Estimates Database itself remains the same except for changes to the estimates for Black Vulture at all scales (see p. 14); the estimates for California Scrub-Jay and Woodhouse’s Scrub-Jay at all scales (p. 14); revised Time of Day adjustments and population estimates at all scales for Mexican Whip-poor-will and Long-eared, Elf, Flammulated, Western Screech, Great Gray, and Northern Hawk owls; the global and USA/Canada estimates for Dusky Grouse, Snowy Owl, and Peregrine Falcon; the global estimates and percent of global estimate in USA/Canada for Black-billed Cuckoo, Belted Kingfisher, Willow Flycatcher, Red-eyed Vireo, Bluethroat, Golden-winged Warbler, American Redstart, and Indigo Bunting; and updated taxonomic sequence and name changes corresponding to the 60th supplement to the AOS Check-list of North American Birds (Chesser et al. 2019).

Version 2020 of the ACAD was also updated taxonomically to the 60th supplement, and extinct and extirpated species removed. The Mig Status field was corrected. This version also includes many changes to PS-g and PT-c and associated fields (including restoring the Pop Change field and adding a PopYr field) based on incorporation of many of the data sources used in Rosenberg et al. 2019 (Science). At the regional level, a small number of northern breeders were changed from PT-r = 3 for unknown trend to a more informative score based on expanded BBS. The Intro to BCR field was dropped due to inconsistencies. The field %WH_UsCa was added, and the complementary field %Breeding Pop in US & Canada was corrected and in some cases nulled where previous percentages appeared questionable. TB-r scores based on TB-c were updated to reflect changes to TB-c. TB-r was copied into TN-r for residents of Guatemala and Costa Rica missing TN-r. The action code PR was corrected. Truncated and missing comments were restored and erroneous comments deleted. The ACAD Handbook Version 2020 was updated to reflect these changes.



March 5, 2019:

The Avian Conservation Assessment Database (ACAD) has been completely updated in 2019 to include assessment data for 1604 breeding species found from Canada to Panama, including waterfowl, shorebirds, waterbirds and landbirds, based on the latest data on population size, trend, distribution and threats, as well as regional assessments for all breeding birds in all U.S. and Canadian BCRs. Regional assessments for Mexico and Central America are currently available via download only from the ACAD homepage.

The Landbird Population Estimates Database (PED) has been updated in 2019 to include the latest population size estimates for 453 landbirds in the U.S. and Canada, including measures of uncertainty as estimated by Stanton et al. 2019. View or download estimates at continental, BCR, and State/Provincial scales. Estimates for BCR x state/province polygons are now available only via download from the PED homepage.



May 2017:The PIF Species Assessment Database, now called the Avian Conservation Assessment Database, has been updated – and expanded! The ACAD (for short) includes all regularly-occurring bird species found in North America and adjacent waters from Canada to Panama, including approximately 1600 species of waterbirds, shorebirds, waterfowl and landbirds.

Currently, only the Global ACAD is available while the Regional ACAD undergoes a similar update, expansion and review. For now, the 2012 version of the Regional Species Assessment Database for landbirds remains available, but we caution that this database contains information that has now been updated in the Global ACAD. We expect the Regional ACAD to be completed by the end of 2017, at which time it will be posted on this site.

The expansion of the ACAD to include all avian taxa in continental North America was made possible through the work and collaboration of various groups in addition to PIF, including the U.S. Shorebird Conservation Partnership, the Migratory Bird Joint Ventures, and dozens of ornithologists from across North America who helped populate and review the contents of the database.

We welcome additional feedback from other groups and individuals to improve upon the information in this first version of the ACAD. Please contact us if you find any errors or omissions. We expect to update the Global ACAD within 1-2 years with additional input received.
13 June 2013: New landing page for both databases published. Avian Conservation Assessment Database address changed from pif.rmbo.org and redirected to new landing page.
April/May 2013: Reviewed, edited and incorporated landbird population estimates and related data into the PIF Population Estimates database. New Population Estimates database dissemination website designed and published. Population estimates in Avian Conservation Assessment database harmonized with updated numbers in Population Estimates database.