Broad-winged Hawk: Buteo platypterus platypterus (Vieillot).—This is an uncommon summer resident in eastern Kansas, in swampy woodland. Specimens taken in the breeding season and nesting records are from Shawnee, Douglas, Leavenworth, and Johnson counties; there are several nesting records from Missouri in the bottomlands just across the river from Wyandotte County Kansas. Occurrence in time is listed in [Table 11].
Breeding schedule.—Four records of nesting span the period April 21 to May 30, but it is likely that the egg-season is longer than this.
Number of eggs.—Clutch-size is about 3 eggs.
Nests are placed high in deciduous trees.
Swainson Hawk: Buteo swainsoni Bonaparte.—This is a common summer resident in prairie grassland with open groves and scattered trees. Records of breeding are available from all parts of the State, but are least numerous from the southeastern quarter. Occurrence in time is listed in [Table 11].
Breeding schedule.—Sixteen records of breeding span the period April 11 to June 10; the modal date for completion of clutches is April 25.
Number of eggs.—Clutch-size is 2 eggs (2.4, 2-3; 5).
Nests are placed about 35 feet high, actually ranging from 12 to 75 feet, in cottonwood, elm, willow, and honey locust. Occasionally nests are placed on ledges in cliffs.
Ferruginous Hawk: Buteo regalis (Gray).—This is an uncommon resident in western Kansas, in grassland with scattered trees. Records of nesting and specimens taken in the breeding season come from Wallace, Hamilton, Gove, Logan, and Finney counties.
Breeding schedule.—Five records of breeding span the period March 11 to April 30.