Phylloscopus sibilatrix

Local summer resident, chiefly in larger woods in eastern half of county, but breeds on west bank of Cleddau (Benton Woods and near Hook).  Only once seen on islands (Skomer, 9 may 1946)

R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society

More about the Wood Warbler in Pembrokeshire