=Bullock Oriole=: _Icterus bullockii_ (Swainson).--This summer resident is common in western Kansas in woodland and riparian situations. The species hybridizes freely with the Baltimore Oriole, and most Bullock Orioles in Kansas show evidence of such interbreeding. Almost all records of breeding come from west of the 100th meridian, but the species in recognizable form probably breeds locally at least as far east as Stafford County. _Breeding schedule._--Few nesting records are available, but these suggest that the breeding schedule of the Bullock Oriole resembles those of the preceding two species in Kansas. _Number of eggs._--Clutch-size is about 4 eggs. Nests are hung about 26 feet high (ranging from 10 to 50 feet) in cottonwood, elm, and other large trees. =Common Grackle=: _Quiscalus quiscula versicolor_ Vieillot.--This summer resident is common in parkland, and around towns and farms. Most individuals move out of Kansas in winter, and the temporal occurrence of these birds is indicated in Table 18. _Breeding schedule._--The 233 records of breeding span the period April 11 to June 30 (Fig. 8); the modal date for egg-laying is May 5, and two-thirds of all eggs are laid between May 1 and May 20. _Number of eggs._--Clutch-size is 5 eggs (4.5, 3-6; 33). Clutches laid at the peak of the season average 4.7 eggs (3-6; 21), and those laid as replacement clutches average 4.3 eggs (3-6; 12). Nests are placed in forks and crotches about 22 feet high (ranging from six to 50 feet) in elm, red cedar, cottonwood, oak, box elder, and pine. =Brown-headed Cowbird=: _Molothrus ater ater_ (Boddaert).--Many individuals of this common summer resident overwinter in the southern part of the State and it is difficult to determine dates of arrival and departure in Kansas. Conspicuous abundance in the north covers the period April to October. _Breeding schedule._--The 141 instances of egg-laying span the period April 21 to July 20 (Fig. 8); the modal date of laying is May 15, and 53 per cent of all eggs are laid in the period May 11 to June 10. Inception of laying is here fairly reliably indicated, but in exceptionally early springs laying does occur earlier; a few eggs were found on April 6, 1963, too late for incorporation into this report other than in this sentence. _Number of eggs._--Clutch-size in cowbirds is not readily determined. On the basis of ovarian examination of five females taken in mid-season, the birds here lay about five eggs at a time. There is no question that the birds are "double-brooded" in Kansas, and the season is sufficiently long for as many as five "clutches" to be laid by a given female.