Puffinus gravis

Mathew has an unsatisfactory record.  One or two probably of this species, off Smalls lighthouse, 3 Sept 1917 (B.Birds, XII 225)

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

More about the Great Shearwater in Pembrokeshire