Upper parts greenish brown with darker spots: breast and sides streaked with brown: above the eye a yellowish white streak.
A. aquaticus, Temm. Man. d'Orn. torn. i. p. 265. Alauda petrosa, Mont, in Linn. Trans, vol. iv. p. 41. Rock Pipit, Selb. Must. vol. i. p. 258. pl. 49. f. 6. Rock Lark, Mont. Orn. Diet. Field Lark, Bew. Brit. Birds, vol. I. p. 216.
Entire length six inches eight lines: length of the bill (from the forehead) six lines and a half, (from the gape) nine lines; of the tarsus ten lines and a half; of the hind toe, claw included, ten lines; of the tail two inches nine lines; from the carpus to the end of the wing three inches five lines: breadth, wings extended, eleven inches three lines.
(Adult). Upper parts dark brown, with a tinge of olive-green; the feathers on the back, and scapulars, obscurely marked with dusky streaks: quills and coverts dusky, edged with greenish white: above the eye a pale streak: all the under parts whitish, with longitudinal brown streaks on the sides of the neck, breast, and flanks: the two middle tail-feathers cinereous brown; the others dusky; the outer one being white in its greater portion, the next tipped with white: bill dusky: irides hazel: feet brown: hind claw curved, about equal to the toe in length. (Young). The olivaceous tinge of the upper parts more conspicuous: under parts yellowish, spotted as in the adult bird: wing-coverts more broadly edged with pale cinereous brown: the white on the outer tail-feathers less pure, inclining to pale dusky. (Egg). Greenish white ground, speckled with ash-brown, darkest at the larger end: long. diam. nine lines and a half; trans, diam. seven lines and a half.
Common on rocky shores, in many parts of the kingdom, where it resides the whole year, but is never found inland. Feeds on marine insects. Song and habits somewhat similar to those of the two last species. Breeds in the clefts of rocks, sometimes at a considerable height from the ground. Nest composed of marine plants, with the addition of a little moss externally, lined with fine grass and a few long hairs. Eggs four or five; hatched early in the Spring.