Number of eggs.—Clutch-size is about 3 eggs (3.3, 3-4; 4).
Nests are placed on the ground surface on small cliffs or promontories or low (six to 10 feet) in small trees such as osage orange, cottonwood, and mulberry.
Marsh Hawk: Circus cyaneus hudsonius (Linnaeus).—This is a local resident in grassland throughout Kansas. Most records of breeding come from east of the Flint Hills, but it is not certain that the few records from the west actually reflect a low density of Marsh Hawks in that area.
Breeding schedule.—Sixteen records of breeding span the period April 11 to May 20; the modal date for egg-laying is May 5.
Number of eggs.—Clutch-size is 5 eggs (5.2, 3-7; 14).
Nests are placed on the ground surface in grassy cover.
Peregrine Falcon: Falco peregrinus anatum Bonaparte.—This falcon nested, perhaps regularly but clearly in small numbers, in Kansas prior to the 20th Century. The best documented breeding occurrence was at Neosho Falls, Woodson County (Goss, 1891:283).
Breeding schedule.—Eggs were recorded as being laid in February and March.
Number of eggs.—Clutch-size is 3 or 4 eggs (Davie, 1898).
Nests are placed relatively high on cliffs and in trees; at Neosho Falls these birds used open cavities 50 to 60 feet high in sycamores.