Number of nests established per bird species in various plant species on the right-of-way on the State Game Lands 33 Research and Demonstration Area, Centre County, Pennsylvania.
| Plant species | No. nests | Bird species (no. nests) |
|---|---|---|
| Blackberry (Rubus allegheniensis) | 17 | indigo bunting (9), gray catbird (1), eastern towhee (1), chestnut-sided warbler (4), red-eyed vireo (1), veery (1) |
| Witch-hazel (Hammamelis virginiana) | 10 | indigo bunting (4), gray catbird (1), eastern towhee (1), American robin (1), red-eyed vireo (1), veery (1), cedar waxwing (1) |
| Blueberry (Vaccinium spp.) | 8 | field sparrow (4), eastern towhee (1), common yellowthroat (2) |
| Sweet fern (Comptonia peregrina) | 4 | indigo bunting (1), field sparrow (3), |
| Multiflora rose (Rosa multiflora) | 3 | gray catbird (1), American robin (2) |
| White oak (Quercus alba) sprouts | 3 | gray catbird (2), eastern towhee (1), indigo bunting (1) |
| Meadow-sweet (Spirea alba) | 2 | indigo bunting (1), field sparrow (1) |
| Chestnut oak (Q. montana) sprouts | 1 | gray catbird (1) |
| Blackberry/sweet fern combined | 1 | field sparrow (1) |
| Blueberry/sweet fern combined | 1 | common yellowthroat (1) |
| Hay-scented fern (Dennstaedtia punctilobula)/sweet fern combined | 1 | eastern towhee (1) |
| Rough goldenrod (Solidago rugosa) | 1 | field sparrow (1) |
| Rough goldenrod/hay-scented fern combined | 1 | common yellowthroat (1) |
| Rough goldenrod/sweet fern combined | 1 | field sparrow (1) |
| Gooseberry (Ribes rotundifolium) | 1 | field sparrow (1) |
| Tartarian honeysuckle (Lonicera tatarica) | 1 | gray catbird (1) |
| Ground level | 1 | eastern towhee (1) |