Jackdaw – 1949

Corvus mondedula spermolegus

Common resident, except at Skokholm and Grassholm, where only a spring migrant at same time as Rook.  Breeds on cliffs and in ruins, etc, inland.  A writer in the Field, 2 June, 1860, noted that it bred in burrows at Skomer; it still does this – in sea-bird burrows on the edge of the cliffs.

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

More about the Jackdaw in Pembrokeshire