The ferruginous hawk (ferruginous = from Latin ferrum – iron, ferrgin-, iron rust, iron-rust color – reddish-brown), Buteo regalis (Latin, royal hawk), is a large bird of prey and belongs to the broad-winged buteo hawks. An old colloquial name is `ferrugineous rough-leg`, due to its similarity to the closely related rough-legged hawk (B. lag.....
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http://en.wikipedia.org/wiki/Ferruginous_hawk
(from the article `hawk`) ...North America, where it migrates in large flocks. Swainson`s hawk (B. swainsoni) is a bird of western North America that migrates to Argentina. ...
Found on
http://www.britannica.com/eb/a-z/f/20
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