In Minnesota, dove nesting extends from early April until early October with a peak in early June. Factors which appear to influence the selection of nest trees are density of cover, availability of horizontal limbs or crotches, proximity to tall perch sites, and proximity to an open view and/or flight path. Spruce shelterbelts were preferred nesting situations. In open situations, nearly 75 per cent of all nests were located on the southwest, south, southeast, or east sides of the trees. In block plantings, there was a tendency for the doves to nest near the edges of the planting and on the side of the tree that faced an edge. Within the season, individual pairs of marked doves ranged over an area that averaged only 52 feet in radius for the placement of their nests. The average renesting interval of 28 marked doves where young had been successfully fledged was 5.5 days. In 12 instances where the first nests were unsuccessful, the average renesting interval was 9.8 days. The number of young fledged per 100 eggs laid varied from 57 to 61 per cent. The fledgling rate for nests terminating prior to July 31 varied between 38 and 51 per cent while that for later nests, between 78 and 85 per cent. Of all eggs laid, 37.3 per cent were lost as eggs and an additional 9.2 per cent were lost as young. Predation and disappearance, desertion, and weather were the leading causes of nest loss. Considering observations of marked adults and population and nest counts, it seems that Minnesota doves average about 3 nesting attempts per year, and that about 3.2 to 4 young are fledged per pair of adults entering the breeding season. Between 16 and 27 per cent of all young fledged left the nest after September 1, and 10 to 17 per cent left after September 10. At one area of high concentration, between 38 and 65 young were fledged per acre of woody cover. Detailed studies of Mourning Dove (Zenaidura macroura) nesting ecology were made at the Madelia Research Center, Watonwan County, Minnesota, from 1957 through July 1959. This area is located in a cash-grain farming region where the primary crops are corn and soybeans. In 1957, additional studies were made by Longley in the vicinity of Kasson and Rochester in southeastern Minnesota in a region which is devoted predominantly to dairy farming. Information on migrational homing of doves at the Madelia Research Center was reported by Harris (1961). Acknowledgments.-We are indebted to the following for help with various phases of the field work: A. B. Erickson, J. B. Moyle, R. A. Chesness, S. D. Schemnitz, P. E. Bremer, Charles Kinsey, M. N. Nelson, B. J. Hayward, Lee Ward, and Bill Meglen. A. B. Erickson made many helpful suggestions regarding the organization of the manuscript. The 1957 work was done while on the Minnesota Division of Game and Fish, Pittman-Robertson Project W-11-R-18.