Meaning of ferruginous hawk in English:
ferruginous hawk
noun
A large hawk, Buteo regalis, of inland grasslands and shrub steppes in North America, occurring in a pale colour morph (which has rusty brown upperparts) and a dark morph (which is chiefly dark brown).
Origin
Late 19th century; earliest use found in Annual Reports Chief of Engineers to Secretary of War (United States).
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