Breeding Characteristics
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Information on clutch size, incubation and nestling periods, and number of broods per season for cavity-nesting birds.
| Species | Clutch Size (# of eggs) |
Incubation Period (days) | Nestling Period | Broods per Season |
| American Kestrel | 3-7 | 28-32 | about 30 days | 1 in North; 2 in South |
| Ash-throated Flycatcher | 3-7 | 15 |
16-17 days | 1 |
| Barn Owl | 4-8 | 30 |
8 weeks | 1 or 2 |
| Black-capped Chickadee | 6-8 | 12-13 | 16 days | 1 |
| Brown-headed Nuthatch | 4-7 | 14 |
18-19 days | 1 |
| Carolina Chickadee | 5-8 | 11-14 | 13-17 days | 1 |
| Carolina Wren | 4-5 | 12-14 | 12-14 days | 1 in North; 2 in South |
| Chestnut-backed Chickadee | 6-7 | 12-14 | 18-23 days |
1 |
| Common Goldeneye | 7-10 | 28-32 |
26-36 hours | 1 |
| Eastern Bluebird | 3-5 | 12-14 | 16-22 days | 2, sometimes 3 |
| Eastern Screech Owl | 3-4 | 26-30 | 28 days | 1 |
| European Starling | 4-6 | 12-13 |
21-23 days | 1 or 2 |
| Great Crested Flycatcher | 4-6 | 13-15 | 14-21 days | 1 |
| Hooded Merganser | 5-13 | 32-33 | 24 hours | 1 |
| House Sparrow | 1-8 | 11-12 |
14 days | up to 4 |
| House Wren | 6-8 | 12-16 | 15-19 | 2, sometimes 3 |
| Mountain Bluebird | 5-6 | 13-14 | 17-22 days | often 2, sometimes 3 |
| Mountain Chickadee | 5-9 | 1-14 | 19-21 days | unknown |
| Northern Flicker | 5-8 | 11-14 | 24-28 days | 1 in North; 2 in South |
| Prothonotary Warbler | 4-6 | 12 | 11 days | 1 in North; 2 in South |
| Purple Martin | 4-6 | 15-16 | 26-28 days | 1 |
| Red-breasted Nuthatch | 4-7 | 12-16 | 14-21 days | unknown |
| Tree Swallow | 4-7 | 14-15 | 16-22 days | 1 |
| Tufted Titmouse | 5-6 | 12-14 | 15-16 days | 1 in North; 2 in South |
| Violet-green Swallow | 4-6 | 13-15 | 23-25 days | 1 |
| Western Bluebird | 4-6 | 13-14 | 19-22 days | probably 2 |
| Western Screech Owl | 2-5 | 21-30 | 28 days | probably 1 |
| White-breasted Nuthatch | 5-10 | 12 | 14-26 days | 1 |
| Wood Duck | 8-10 | 27-37 | 26-36 hours | 1 in North; 2 in South |