Additional information on: Breeding Bird Survey (BBS): Relative Abundance and Breeding Distribution (1993-2016)
Legend: Estimated average birds/route/year; semi-transparent grey = degree blocks in strata with species estimates but no data contributing to estimate (species not observed or no BBS routes); dark grey = strata with no BBS data for species; blue line = approximate limit of species breeding range (Birdlife International).
Map was produced by Adam C. Smith, Environment and Climate Change Canada, based on data from the North American Breeding Bird Survey.