Above bluish ash, with darker fasciae; beneath yellowish white, with brown transverse bars; a broad black moustache: wings reaching to the extremity of the tail.
F. peregrinus, Temm. Man. d'Orn. torn. i. p.22. Peregrine Falcon, Mont. Orn. Diet, and Supp. Selb. Must. vol. i. p. 39. pls. 15 and 15*. Bew. Brit. Birds, vol. i. p. 17.
Entire length (male) fifteen inches, (female) seventeen inches; from the carpus to the end of the wing fourteen inches; tarsus two inches.
(Adult male). Head, upper part of the neck, and a broad moustache descending from the corners of the mouth, blackish blue: rest of the upper parts bluish ash, with shades of a darker tint: throat and breast white, with a few fine longitudinal streaks; belly, vent, and thighs, grayish white, with brown transverse bars: quills dusky, the inner webs with a series of reddish white spots: tail alternately barred with black and gray: bill bluish at the base, black at the tip: cere, space surrounding the eyes, irides, and feet, yellow. (Adult female). Colour of the upper plumage more dull: under parts with a faint reddish tinge. (Young). Upper parts ash-brown, the feathers with pale reddish edges; region of the eyes, and moustaches, dusky, the latter ill-defined: throat white; rest of the under parts whitish, with large brown longitudinal spots of an oblong heart-shaped form: tail with irregular reddish bars; the tip white: irides brown. (Egg). Mottled all over with two shades of red brown: long. diam. two inches one line; trans, diam. one inch eight lines.
Not very abundant in England: more plentiful in the northern parts of Scotland. Preys on birds. Builds on rocks, or in trees, and lays from three to four eggs. Obs. The Lanner of Pennant is the young of this species: the Falco Lanarius of Temminck is a distinct species, which has not hitherto been found in this country.