Sylvia borin
Local summer resident but widely distributed especially in south-east. Bertram Lloyd heard them singing freely in north of the county 1921, 1925, 1926, and considered the species was probably more numerous than the Blackcap. On islands scarce passage migrant, chiefly in spring.
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society