Corvus frugilegus frugilegus

Resident and numerous.  Rookeries in 1945 were 147, containing 9,664 nests (James Fisher – BTO national survey). Marked spring migration at Skokholm during March and April.

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

More about the Rook in Pembrokeshire