Buteo elegans, Cassin (adult). (Correction and modern nomenclature: Aplomado Falcon, adult, Falco femoralis. Original caption was in error, Buteo elegans refers to another plate from this source, showing a Red-shouldered Hawk, Buteo lineatus.) From: Reports of Explorations and Surveys.... Volume X. 1859 of the U. S. Pacific railroad Explorations and Surveys 38th, 39th, 41st Parallels. Copied from NOAA Photo Library.

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