Caution! No species is found on every route, and some routes have data of insufficient quality to estimate change. Consequently, some analyses will provide empty graphs, and "NaN" errors indicating insufficient information.
1966 - 2006 Analysis
See the BBS Summary and Analysis Website for citation, version number, and cautions regarding use.
Select state of interest:
Continental United States Routes
Alaska, Canada, and Mexico Routes
|Prince Edward Island|
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