The European rock pipit (Anthus petrosus), or simply rock pipit, is a species of small passerine bird that breeds in western Europe on rocky coasts. It has streaked greyish-brown upperparts and buff underparts, and is similar in appearance to other European pipits. There are three subspecies, of which only the Fennoscandian one is migratory, wintering in shoreline habitats further south in Europe. The European rock pipit is territorial at least in the breeding season, and year-round where it is resident. Males will sometimes enter an adjacent territory to assist the resident in repelling an intruder, behaviour only otherwise known from the African fiddler crab.
European rock pipits construct a cup nest under coastal vegetation or in cliff crevices and lay four to six speckled pale grey eggs which hatch in about two weeks with a further 16 days to fledging. Although insects are occasionally caught in flight, the pipits feed mainly on small invertebrates picked off the rocks or from shallow water.
The European rock pipit may be hunted by birds of prey, infested by parasites such as fleas, or act as an involuntary host to the common cuckoo, but overall its population is large and stable, and it is therefore evaluated as a species of least concern by the International Union for Conservation of Nature (IUCN).
Taxonomy and systematics
The family Motacillidae consists of the wagtails, pipits and longclaws. The largest of these groups is the pipits in the genus Anthus, which are typically brown-plumaged terrestrial insectivores. Their similar appearances have led to taxonomic problems; the water pipit and the buff-bellied pipit were considered subspecies of the European rock pipit until they were separated by the British Ornithologists' Union in 1998. The European rock pipit is closely related to the meadow, red-throated and rosy pipits as well as its former subspecies.
The first formal description naming this species was by English naturalist George Montagu in 1798. It had previously been described in 1766 by Thomas Pennant, in the first edition of British Zoology, although he did not distinguish it from the common titlark (meadow pipit). It was first shown to be different from that species by John Walcott in the 1789 edition of his Synopsis of British Birds, in which he called it the sea lark. John Latham was the first to give the European rock pipit a scientific name, Alauda obscura in 1790, but the specimen he examined had been misidentified as to the species and was in fact a dusky lark. In the same year, Montagu, whom Latham had consulted about the bird, discovered the European rock pipit on the coast of South Wales, where it was known to some fishermen in the region as the "rock lark". He adopted that name for the species and gave it the scientific name Alauda petrosus.
The scientific name of the European rock pipit is from Latin. Anthus is the name given by Pliny the Elder to a small bird of grasslands, and the specific petrosus means "rocky", from petrus, "rock".
There are three recognised subspecies of the European rock pipit:
A. p. kleinschmidti is sometimes merged with the nominate form, A. p. petrosus. The suggested subspecies A. p. meinertzhageni on South Uist, A. p. hesperianus on the Isle of Arran, and A. p. ponens in northwestern France cannot be reliably separated from the nominate form. There is a geographical trend in appearance, with longer-billed, darker birds at the western end of the range, and shorter-billed, paler individuals in the east.
Description
The European rock pipit is long and weighs . The nominate race has smoky-olive upperparts, weakly streaked with darker brown, and buff underparts, heavily marked with poorly defined brown streaks. The legs, bill and iris are dark brown or blackish, and there is a pale eye-ring. The sexes are alike; although males average slightly brighter than females, the overlap is complete and birds cannot be sexed on appearance or measurements. Immature birds resemble the adult, although they may sometimes be browner and more streaked above, looking superficially similar to meadow pipits.
Compared to the nominate form, A. p. kleinschmidti has slightly yellower, less olive, upperparts and brighter and yellower underparts between the breast streaking. A. p. littoralis may show pinkish underparts and a pale supercilium (eyebrow) in summer, thereby resembling the water pipit. Vagrant European rock pipits in winter are readily distinguishable from water pipits, but very difficult to assign to subspecies by appearance or measurements. The western populations are known to be nearly sedentary, so east of the Elbe basin vagrant Eurasian rock pipits are presumably mostly littoralis.