(transitive) To make ferruginous.

plural of ferruginization

plural of ferruginous hawk

(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

plural of ferruginous duck

Aythya nyroca, a medium-sized diving duck from Eurasia