Podiceps ruficollis ruficollis
Although Mathew stated that it "is the only one that nests in Pembrokeshire" apparently it does not breed, but is numerous in winter. Bertram Lloyd records a flock of forty on the mill-pond at Pembroke, Xmas 1925. Has been seen Skokholm.
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society