Buteo calurus. Red-tailed Black Hawk. (Modern nomenclature: Western Red-tailed Hawk, Buteo jamaicensis calurus, see, for example, ITIS archive copy at the Wayback Machine). From: Reports of Explorations and Surveys.... Volume X. 1859 of the U. S. Pacific railroad Explorations and Surveys 38th, 39th, 41st Parallels.

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