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Federal
North American Breeding Bird Survey (BBS) Regional Dataset [within 5 Miles of National Wildlife Refuges], 1997 - 2019
Department of the Interior —
This dataset is a subset of data attributes selected from the (full) 1966-2019 North American Breeding Bird Survey (BBS) dataset to assist in populating the U.S. Fish... -
Federal
WBPHS stratum densities by species
Department of the Interior —
Annual total indicated birds per square mile by survey stratum and species or species group, uncorrected for detection bias, are provided for the entire survey area,...