Gerfalcon
or JER-FALCON (-fâkon), in zoölogy, the Falco Gyrfalco, a species of falcon considered as the boldest and most beautiful of the tribe. In size it approaches closely to that of the osprey. Its general color is brownishgray, of varied tints above and white beneath, and brown longitudinal spots.
The tail is crossed with a number of deeper and lighter bands, and the bill and legs are usually of a pale-blue or yellowish color. The gerfalcon is a native of Russia, Norway, Iceland, and Baffin's Bay. It is considered one of the most formidable of all rapacious birds.