How accurate is the Breeding Bird Survey and Christmas Bird Count?
Breeding Bird Survey (BBS) and the Christmas Bird Count (CBC) sites are randomly selected and do not represent areas of increased risk associated with bird abundance and migration patterns. 2. North American Breeding Bird Survey (BBS) The North American Breeding Bird Survey (BBS) data served as the source for interpolation of bird species abundance during the breeding season. The BBS database was obtained online from the USGS Patuxent Wildlife Research Center (comp.) website. The portions of the dataset used in the model spans a recording period of 38 years, beginning from May, 1966 and ending in June, 2003. The Breeding Bird Survey (BBS) is conducted each year at survey sites across the US. 2167 sites were used in the development of the US BAM. Surveys occur at designated survey sites and are conducted along a 39.4 km route. The site coordinates are recorded and represent the starting point of each 39.4 km route. A digital database is then created in ASCII file format. This database c
