Cygnus bewickii bewickii
Mathew gives the following records: Trevithan Pool, 10 Nov 1887. five immatures near St Davids, 1887; an immature near St Davids Dec 1890, in which winter many swans were seen; and a herd of fifteen there Nove 1982, probably of this species. one other in 1905. No recent records.
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society