Abstract
This report describes the contents of the Canadian Breeding Bird (Mapping) Census Database. The data are derived from "spot- or territory-mapping" censuses in variablysized plots across Canada. Habitat codes are appended to each plot to define the primary, and, often, secondary, habitat types present within the plot, and dominant canopy, shrub and ground cover species are listed. Densities are calculated per 100 hectares for all bird species detected on a plot. The databases contain 928 censuses of 640 distinct plots, with records for 285 species of birds. Censuses span the years from 1927 to 1993, and were conducted in every province and territory except Prince Edward Island. The bulk of the data were collected between the mid-1960s and the early 1980s, after which point there was a steady decline in censusing. The databases and report are available for downloading from this site.
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