In 1966, the U.S. Fish and Wildlife Service initiated the North American Breeding Bird Survey (BBS) to monitor bird populations across the continental U.S. and Canada. The BBS is jointly coordinated by the USGS Patuxent Wildlife Research Center and Canadian Wildlife Service and is active in 49 states and all Canadian provinces with more than 2200 skilled observers participating in the program each year. The BBS has accumulated over 35 years o...
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