https://www.usgs.gov/data/breeding-bird-survey-songbird-occurrences-during-1977-1979-and-2012-2014-conterminous-us
Data used in: "Misleading prioritizations from modeling range shifts under climate change" by H.R. Sofaer, C.S. Jarnevich, and C.H. Flather. Breeding Bird...
breeding bird surveysongbird
https://www.usgs.gov/centers/eesc/news/north-american-breeding-bird-survey-helping-keep-common-birds-common
The North American Breeding Bird Survey was initiated in 1966 to monitor bird populations over large geographic areas.
the north americanbreeding bird surveyhelpingkeepcommon