Bull. 1. Bent, Arthur C. 1923. Life histories of North American waterfowl. Part I. U.S. Natl. Mus. Bull. 126, Wash., D.C. 244 p. (Reprinted by Dover Publ., Inc., New York 1962). Bent, Arthur C. 1937. Life histories of North American birds of prey. Vol. I. U.S. Natl. Mus. Bull. 167, Wash., D.C. 409 p. (Reprinted by Dover Publ., Inc., New York 1961). Bent, Arthur C. 1938. Life histories of North American birds of prey. Vol. II. U.S. Natl. Mus. Bull. 170, Wash., D.C. 495 p. (Reprinted by Dover Publ., Inc., New York 1961). Bent, Arthur C. 1939. Life histories of North American woodpeckers. U.S. Natl. Mus. Bull. 174, Wash., D.C. 334 p. (Reprinted by Dover Publ., Inc., New York 1964). Bent, Arthur C. 1940. Life histories of North American cuckoos, goatsuckers, hummingbirds, and their allies. U.S. Natl. Mus. Bull. 176, Wash., D.C. 506 p. (Reprinted by Dover Publ., Inc., New York 1964). Bent, Arthur C. 1942. Life histories of North American flycatchers, larks, swallows, and their allies. U.S. Natl. Mus. Bull. 179, Wash., D.C. 555 p. (Reprinted by Dover Publ., Inc., New York 1963). Bent, Arthur C. 1946. Life histories of North American jays, crows, and titmice. U.S. Natl. Mus. Bull. 191, Wash., D.C. 495 p. (Reprinted by Dover Publ., Inc., New York 1964). Bent, Arthur C. 1948. Life histories of North American nuthatches, wrens, thrashers, and their allies. U.S. Natl. Mus. Bull. 195, Wash., D.C. 475 p. (Reprinted by Dover Publ., Inc., New York 1964). Bent, Arthur C. 1949. Life histories of North American thrushes, kinglets, and their allies. U.S. Natl. Mus. Bull. 196, Wash., D.C. 454 p. Bent, Arthur C. 1950. Life histories of North American wagtails, shrikes, vireos, and their allies. U.S. Natl. Mus. Bull. 197, Wash., D.C. 411 p. (Reprinted by Dover Publ., Inc., New York 1965). Bent, Arthur C. 1953. Life histories of North American wood warblers. U.S. Natl. Mus. Bull. 203, Wash., D.C. 734 p. Bock, Carl F. 1970. The ecology and behavior of the Lewis woodpecker (_Asyndesmus lewis_). Univ. Calif. Publ. Zoology, Vol. 92, 100 p. Univ. Calif. Press, Berkeley and Los Angeles. Bolen, E. G. 1967. Nesting boxes for black-bellied tree ducks. J. Wildl. Manage. 31(4):794-797. Bolen, Eric G. and Billy J. Forsyth. 1967. Foods of the black-bellied tree duck in south Texas. Wilson Bull. 79(1):43-49. Bolen, E. G., B. McDaniel, and C. Cottam. 1964. Natural history of the black-bellied tree duck (_Dendrocygna autumnalis_) in southern Texas. Southwest Nat. 9(2):78-88. Brewer, Richard. 1961. Comparative notes on the life history of the Carolina chickadee. Wilson Bull. 73(4):348-373. Brock, Elbert M.