1958. Some prey of the pygmy owl. Condor 60(5):338. Brown, Leslie, and Dean Amadon. 1968. _Falco peregrinus_, peregrine falcon. P. 850-856. _In_ Eagles, hawks and falcons of the world. Vol. 2. McGraw-Hill, New York. Brown, Vinson, and Henry G. Weston, Jr. 1961. Handbook of California Birds. Naturegraph Co., Calif. 224 p. Bruns, Herbert. 1960. The economic importance of birds in forests. Bird Study 7(4):193-208. Bunch, Carl H. 1964. Nesting of the western purple martin. Murrelet 45(1):10-11. Burleigh, Thomas D. 1972. Birds of Idaho. The Caxtonprinters Ld., Caldwell, Idaho. 467 p. Burton, J. A., ed. 1973. Owls of the world. E. P. Dalton and Co., Inc., New York. 216 p. Carter, Brian C. 1958. The American goldeneye in central New Brunswick. Canadian Wildl. Serv. Wildl. Manage. Bull., Series 2(9). 47 p. Catling, Paul M. 1972. A study of the boreal owl in southern Ontario with particular reference to the irruption of 1968-69. Can. Field Nat. 86(3):223-232. Cink, C. L. 1976. The influence of early learning on nest site selection in the house sparrow. Condor 78(1):103-104. Conner, Richard N., Robert G. Hooper, Hewlette S. Crawford, and Henry S. Mosby. 1975. Woodpecker nesting habitat in cut and uncut woodlands in Virginia. J. Wildl. Manage. 39(1):144-150. Cooke, W. W. 1888. Report on bird migration in the Mississippi Valley in the years 1884 and 1885. U.S. Dep. Agric., Div. Econ. Ornith., Bull. 2. 313 p. Cottam, Clarence. 1939. Food habits of North American diving ducks. U.S. Dep. Agric. Tech. Bull. 643. 140 p. Craighead, John, and Frank Craighead. 1940. Nesting pigeon hawks. Wilson Bull. 52:241-248. Crockett, Allen B., and Harlow H. Hadow. 1975. Nest site selection by Williamson and red-naped sapsuckers. Condor 77(3):365-368. Crosby, Gilbert T. 1971. Ecology of the red-cockaded woodpecker in the nesting season. M.S. thesis. Univ. of Florida, Gainesville. Davis, John, George F. Fisher, and Betty S. Davis. 1963. The breeding biology of the western flycatcher. Condor 65(5):337-382. de Kiriline, Louise. 1952. Red-breast makes a home. Audubon 54(1):16-21. Dennis, John V. 1967. The ivory-bill flies still. Audubon 11:38-45. Dippie, George F. 1895. Nesting of Richardson’s merlin. Oologist 11:236-237. Dunn, Harry H. 1901. The spotted owl. Oologist 18:165-167. Emlen, John T., Jr. 1937. Bird damage to almonds in California. Condor 39:192-197. Erskine, Anthony J. 1971. Buffleheads. Canadian Wildl. Serv., Monograph Series 4. 240 pp. Erskine, A. J., and W. D. McLaren. 1972. Sapsucker nest holes and their use by other species. Can. Field. Nat. 86(4):357-361. Ferguson, Henry L. 1922. The fall migration of hawks as observed at Fisher’s Island,