Falco peregrinus peregrinus
Maximum number of eyries which could be occupied in one year probably 35. Average number of occupied eyries pre-World War II probably 25-28. During the war it was persecuted and is now less numerous (about 18 pairs in 1947)
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society