Introduction
The Breeding Bird Survey (BBS) is a cooperative effort among skilled amateur and professional ornithologists to document long-term changes in bird populations. The BBS is jointly coordinated by the U.S. Geological Survey (USGS) Patuxent Wildlife Research Center and the Canadian Wildlife Service (CWS). In Canada and the United States, the data are widely used by researchers, government agencies, nongovernmental organizations, and the public for information on changes in terrestrial bird populations in North America and as a basis for decisions on conservation and management. For most landbirds, the BBS is the only source of long-term data on population change that extends throughout the continent. The BBS began in 1966 in the eastern United States and eastern maritime Canada and has since expanded throughout the United States and Canada, including Alaska, Yukon, and a few routes in the Northwest Territories (Figure 1).
This Progress Note presents the Canadian population trends from 1967 to 1998 for the 253 species of birds recorded on the BBS for which sample sizes are sufficient for analysis. Results of North American analyses are available on the USGS-Patuxent BBS Web site. Raw data can be downloaded directly from the USGS-Patuxent BBS Web site or are available on request to the second author.
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