Nests are placed in crotches of sycamore, cottonwood, elm, hackberry, oak, and walnut, from 30 to 60 feet high; the average height is about 40 feet.
Table 10.—Occurrence in Time of Summer Resident Herons in Kansas
| Species | Arrival | Departure | ||
| Range | Median | Range | Median | |
| Great Blue Heron | Feb. 4-Apr. 8 | Mar. 20 | Oct. 10-Nov. 29 | Oct. 23 |
| Green Heron | Mar. 29-May 4 | Apr. 27 | Sept. 1-Oct. 30 | Sept. 9 |
| Common Egret | Apr. 8-May 12 | Apr. 2 | Sept. 4-Sept. 30 | Sept. 21 |
| Black-crowned Night Heron | Mar. 27-May 18 | Apr. 25 | Sept. 10-Nov. 11 | Sept. 25 |
| Yellow-crowned Night Heron | Apr. 15-May 18 | Apr. 27 | ........ | ........ |
| American Bittern | Apr. 4-May 9 | May 1 | Oct. 6-Dec. 12 | Oct. 16 |
| Least Bittern | Apr. 9-May 22 | Apr. 8 | Oct. 24 | ........ |
Green Heron: Butorides virescens virescens (Linnaeus).—This is a common summer resident about streams, lakes, and marshes throughout the State. Some characteristics of the temporal occurrence of this species are indicated in [Table 10].
Breeding schedule.—Twenty-eight records of breeding span the period April 21 to June 20 ([Fig. 3]); the modal date of completion of clutches is May 5.
Number of eggs.—Clutch-size is 3 eggs (3.1, 3-5; 17).
Nests are placed about 10 feet high (two to 35 feet) in willow, cottonwood, elm, and the like.
Little Blue Heron: Florida caerulea caerulea (Linnaeus).—This is chiefly a postbreeding summer visitant, but there is one record of breeding in Finney County (Tordoff, 1956:312).
Breeding schedule.—There is no information on breeding schedule in Kansas or in adjacent areas.
Number of eggs.—Clutch-size is 2 to 4 eggs (Davie, 1898).