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The North American Breeding Bird Survey (BBS) was formally launched in 1966 when approximately 600 surveys were conducted in the U.S. and Canada east of the Mississippi River. Today there are approximately 3700 active BBS routes across the continental U.S. and Canada, of which nearly 2900 are surveyed annually. Breeding Bird Surveys are conducted during the peak of the nesting season, primarily in June, although surveys in desert regions and some southern states, (where the breeding season begins earlier), are conducted in May. Each route is 24.5 miles long, with a total of fifty stops located at 0.5 mile intervals along the route. A three-minute point count is conducted at each stop, during which the observer records all birds heard or seen within 0.25 mile of the stop.
BBS Survey Routes map layer available at: http://sagemap.wr.usgs.gov/FTP/unitedstates/NATLAS/birdm.htm