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Phenology effects in the North American Breeding Bird Survey

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: May 05, 2026 at 08:54 PM | Dataset Last Updated: September 20, 2022 at 12:00 AM
This data product provides summary information, by species, of changes in relative visibility of birds (phenology effects) through the April - July time period in which the North American Breeding Bird Survey (BBS) is conducted. Data are presented for 408 species of birds. Seasonal phenology effects are presented for selected latitudes and years, documenting changes in visibility and a variety of statistics to allow users to assess the significance of those effects. Results are presented as csv files, with additional information provided in R data sets, and summarized graphical form in species-specific pdf files. Metadata associated with this data product provides information specific to the analysis results.

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