Common resident, except at Skokholm and Grassholm, where only a spring migrant at same time as Rook. Breeds on cliffs and in ruins, etc, inland. A writer in the Field, 2 June, 1860, noted that it bred in burrows at Skomer; it still does this – in sea-bird burrows on the edge of the cliffs.
Mathew thought it was common all round the coast from Tenby to Dinas c.1840-50, but by 1894 it was fast becoming scarce. Formerly nested in ruins of Bishop’s Palace at St Davids, and was breeding “in great abundance” on Manorbier Castle about 1857.
Probably no scarcer now than it was fifty years ago. In 1948 approximately 35 pairs breeding, all on coast or islands.
In 1880 bred only in a few places, including St Davids, but by 1894 rapidly establishing itself. Still rare in same parts as a breeder, and curiously local in distribution in the summer. Absent from many villages, eg: Fishguard, in the west especially (only six pairs St Davids 1948), but has lately colonised Skokholm (two pairs 1944, about six pairs 1948), and Skomer (one pair 1946). Abundant winter visitor, roosting in large numbers 1947-8 at Sealyham, Woodbine (nr Haverfordwest), Goodwick and Tenby marshes, and in smaller roosts elsewhere (eg Monk Haven). These visitors possibly include immigrants from the Continent.
Common resident, but not universally numerous. Scarcer as a breeder in treeless country. Abundant in winter, especially on coastal farms. regular spring migrant at Skokholm, which it also visits in winter.