Passer domesticus domesticus
Not numerous, and is absent from whole villages, though present in small numbers in all large villages and towns. Fluctuates and does not appear to increase permanently. Has bred Caldey and Ramsey, but casual on other islands.
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society