Breeding schedule.—Sixteen records of breeding span the period May 11 to July 20; the modal date for egg-laying is June 15.
Number of eggs.—Clutch-size is 5 eggs (4.6, 3-7; 5).
Nests are placed in holes in rocks, occasionally in rodent burrows, from ground level to 80 feet high on faces of cliffs, but there averaging about 20 feet.
Northern Mockingbird: Mimus polyglottos (Linnaeus).—This is a common resident in parkland and brushy savannah throughout Kansas. M. p. polyglottos (Linnaeus) occurs in the east, and M. p. leucopterus (Vigors) in the west; a broad zone of intergradation exists between the two. Most specimens from Kansas are of intermediate morphology.
Breeding schedule.—Sixty-nine records of breeding span the period April 21 to July 31 ([Fig. 7]); the modal date for first clutches is June 5, but is weakly indicated in the histogram ([Fig. 7]).
Number of eggs.—Clutch-size is 3 eggs (3.5, 3-5; 27). Size of clutch does not vary seasonally or geographically in the present sample.
Nests are placed about four feet high (two to 10 feet) in osage orange, red cedar, mulberry, scotch pine, catalpa, cottonwood, rose, and arbor vitae.
Catbird: Dumetella carolinensis (Linnaeus).—This is a common summer resident in the eastern half of Kansas, but is local in the west, in and near woodland edge and second-growth. First dates of arrival in spring are from April 25 to May 14 (the median is May 6), and last dates of autumnal occurrence are between September 20 and November 16 (the median is September 26).
Breeding schedule.—Seventy-seven records of breeding span the period May 11 to July 31 ([Fig. 7]); the modal date for egg-laying is May 25, and 57 per cent of all clutches are laid from May 21 to June 10.
Number of eggs.—Clutch-size is 4 eggs (3.3, 2-5; 43). Clutches laid between May 11 and June 10 tend to be of 4 eggs (3.5, 2-5; 27), and clutches laid between June 11 and July 31 tend to be of 3 eggs (2.9, 2-4; 16).