Plumage white, with dusky lines and spots.
F. Islandicus, Temm. Man. d'Orn. torn. I. p. 17. Jer-Falcon, Mont. Orn. Diet, and Supp. Selb. Must. vol. I. p. 36. pl. 14. Bew. Brit. Birds, vol. i. p. 15.
Entire length (male) one foot ten inches, (female) two feet. Temm.
(Old male). Ground of the plumage white: upper parts marked with narrow streaks of brown; under parts with spots of the same colour, which become larger and more numerous on the sides: bill yellowish: cere and orbits livid yellow: irides brown: feet bright yellow. (Old female, and immature male). Spots on the under parts more numerous; confluent on the sides, forming transverse bars: the markings above more extended, and occupying a larger portion of the entire plumage. (Young of the year). Upper parts of a uniform brownish ash, the white appearing only in small spots at the tips of the feathers: under parts with large brown spots disposed longitudinally upon a white ground: cere and orbits bluish: feet lead-colour, with a tinge of yellow. (Egg). " Spotted, of the size of a Ptarmigan's." Flem.
Occurs in the northern parts of Scotland, particularly in the Orkney and Shetland Isles; but is of very rare occurrence in England. Sheppard mentions one that was shot on Bungay Common in Suffolk. Preys on birds and the smaller quadrupeds. Obs. The Spotted Falcon of Pennant is the young of this species.