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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Rourke, F. | 1948 | Some observations on bird mortality in Ireland during the winter 1946-1947, with special reference to fieldfares and redwings | Journal | Ir. Nat. J. | Details... |
| Odell, I.M. | 1913 | Early swallows at Ardmore | Journal | Ir. Nat. | Details... |
| Odlum, W.P. | 1943 | Hawfinch in Co. Dublin | Journal | Ir. Nat. J. | Details... |
| Odlum, W.P. | 1955 | Bird notes from the Bull Island, Dublin | Journal | Ir. Nat. J. | Details... |
| Odlum, W.P., Cummins, N.P. & Grainger, J.N.R. | 1945 | Turtle dove in Co. Mayo | Journal | Ir. Nat. J. | Details... |
| Omagh Naturalists' Field Club | 1906 | Omagh Naturalists' Field Club | Journal | Ir. Nat. | Details... |
| Orr, H.K. | 1907 | Ornithomyia avicularia on starlings | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1899 | Maternal affection of wild birds and vitality of some eggs | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1910 | Ring-dove feeding on ivy berries | Journal | Ir. Nat. | Details... |
| Orr, J. | 1930 | Report of Zoological Section | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Pack-Beresford, D.J. | 1950 | Increase of siskins in Ireland | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, D.R. | 1911 | Mealy redpoll in Co Carlow | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1911 | The quail in Ireland | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1921 | Ravens on Howth | Journal | Ir. Nat. | Details... |
| Pack-Beresford, H.D. | 1921 | Woodcock in Dublin | Journal | Ir. Nat. | Details... |
| Pack-Beresford, H.D. | 1936 | Cat kills stoat and stoat kills carrier pigeon | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, H.D. | 1936 | Swifts on return flight | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, H.D. | 1943 | Hoopoe in Co. Dublin | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, H.D. | 1945 | Rose-coloured starling in Co. Dublin | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, R. | 1922 | Curlew's eggs in wild duck's nest | Journal | Ir. Nat. | Details... |
2846 references found.