ferruginous hawk Directory References Discover Timeline of the Space Race, 1957–69 12 Greek Gods and Goddesses 10 Great Sports Rivalries 8 Birds That Can’t Fly 6 Things You Should Know About Meghan, Duchess of Sussex 9 of the World’s Deadliest Mammals What Is the Emoluments Clause? Contents ferruginous hawk bird Ask the Chatbot a Question Ask the Chatbot a Question Also known as: Buteo regalis Learn about this topic in these articles:size In hawk…notable rough-legged hawks are the ferruginous hawk (B. regalis)—the largest North American buzzard (up to 63 cm [25 inches] long)—and the rough-legged hawk (B. lagopus) of both the Old and New Worlds.Read More