What is "ferruginous hawk"

n. (Buteo regalis), a large bird of prey. It is not a true hawk like sparrowhawks or goshawks, but rather belongs to the broad-tailed Buteo hawks, known as "buzzards" in Europe

The ferruginous hawk (ferruginous = from Latin ferrum – iron, ferrugin-, 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. lagopus).

This species is a large, broad-winged hawk of the open, arid grasslands, prairie and shrub steppe country; it is endemic to the interior parts of North America. It is used as a falconry bird in its native range.