Nests are placed 16 to 30 feet high in forks of mature deciduous trees.
Red-eyed Vireo: Vireo olivaceus olivaceus (Linnaeus).—This summer resident is common in the east, but is local and less abundant in the west, in woodland and deciduous forest. Temporal occurrence is indicated in [Table 16].
Breeding schedule.—Eight records of breeding fall in the period May 21 to July 31; most records of egg-laying are in the first week of June.
Number of eggs.—Clutch-size is 4 eggs (4.0, 3-5; 5).
Nests are placed in forks of mature deciduous trees, usually fairly high—perhaps 15 to 25 feet (Davie, 1898).
Table 16.—Occurrence in Time of Summer Resident Vireos in Kansas
| Species | Arrival | Departure | ||
| Range | Median | Range | Median | |
| White-eyed Vireo | Apr. 23-May 25 | May 8 | Oct. 5 | ........ |
| Bell Vireo | Apr. 14-May 20 | May 8 | Aug. 26-Sept. 27 | Sept. 6 |
| Yellow-throated Vireo | Apr. 27-May 22 | May 7 | Aug. 23-Oct. 1 | Aug. 31 |
| Red-eyed Vireo | Apr. 21-May 10 | May 4 | Sept. 2-Oct. 7 | Sept. 10 |
| Warbling Vireo | Apr. 20-May 9 | Apr. 28 | Sept. 2-Oct. 6 | Sept. 9 |
Warbling Vireo: Vireo gilvus gilvus (Vieillot).—This summer resident is common in woodland and forest edge. Temporal occurrence is indicated in [Table 16].
Breeding schedule.—Seventeen records of breeding span the period May 1 to June 20, but it is likely that breeding later in June and July will be recorded. The modal date for egg-laying is June 5, and this seems to be a reliable index to the major effort in egg-laying in spite of the small sample.
Number of eggs.—Clutch-size is 4 eggs (3.6, 3-4; 5). Nests are placed three to 25 feet high in a variety of deciduous shrubs and trees.