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Encyclopedic overview
The ferruginous hawk (Buteo regalis) 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. lagopus).
The generic name buteo is Latin for 'buzzard'. The specific epithet regalis is Latin for 'royal' (from rex, regis, 'king'). The common name 'ferruginous' means 'rust-colored' or 'reddish-brown'.
Excerpted from Wikipedia’s “Ferruginous Hawk” article, available under the CC BY-SA 4.0 licence.