BBS Route · Pennsylvania · BCR 13
Slippery Rk Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 100 species recorded across 25 survey years, no longer active.
100Species Recorded
25Years Surveyed
1970–1994Span
2Observers
Bird Species Found on Pennsylvania Slippery Rk
Top 40 of 100 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Canada Goose | Anatidae | 99 | 1994 | +405% | 1989 | |
| Common Grackle | Icteridae | 96 | 1994 | -43% | 1972 | |
| American Robin | Turdidae | 80 | 1994 | -17% | 1972 | |
| Red-winged Blackbird | Icteridae | 54 | 1994 | -17% | 1972 | |
| House Sparrow | Passeridae | 52 | 1994 | -26% | 1972 | |
| Chimney Swift | Apodidae | 37 | 1994 | +17% | 1973 | |
| House Finch | Fringillidae | 30 | 1994 | +0% | 1987 | |
| Mourning Dove | Columbidae | 28 | 1994 | +56% | 1972 | |
| European Starling | Sturnidae | 21 | 1994 | -71% | 1972 | |
| Barn Swallow | Hirundinidae | 18 | 1994 | +36% | 1972 | |
| American Crow | Corvidae | 17 | 1994 | +37% | 1972 | |
| Chipping Sparrow | Passerellidae | 15 | 1994 | -36% | 1972 | |
| Song Sparrow | Passerellidae | 9 | 1994 | -55% | 1972 | |
| Gray Catbird | Mimidae | 8 | 1994 | +67% | 1972 | |
| Northern Cardinal | Cardinalidae | 6 | 1994 | +21% | 1972 | |
| Mallard | Anatidae | 5 | 1993 | +57% | 1977 | |
| Eastern Phoebe | Tyrannidae | 4 | 1994 | +25% | 1974 | |
| Scarlet Tanager | Cardinalidae | 4 | 1990 | +0% | 1976 | |
| Wood Thrush | Turdidae | 4 | 1994 | +0% | 1973 | |
| Bank Swallow | Hirundinidae | 4 | 1988 | +180% | 1979 | |
| Yellow-billed Cuckoo | Cuculidae | 4 | 1991 | +300% | 1990 | |
| Rock Pigeon | Columbidae | 3 | 1994 | +92% | 1972 | |
| Indigo Bunting | Cardinalidae | 3 | 1994 | -30% | 1974 | |
| Common Yellowthroat | Parulidae | 3 | 1994 | +27% | 1972 | |
| Brown Thrasher | Mimidae | 3 | 1992 | -55% | 1976 | |
| Northern House Wren | Troglodytidae | 3 | 1994 | +180% | 1972 | |
| Savannah Sparrow | Passerellidae | 3 | 1989 | +200% | 1973 | |
| White-breasted Nuthatch | Sittidae | 3 | 1988 | +33% | 1982 | |
| Blue-winged Teal | Anatidae | 3 | 1985 | +200% | 1982 | |
| Great Blue Heron | Ardeidae | 2 | 1994 | +0% | 1973 | |
| Blue Jay | Corvidae | 2 | 1994 | +18% | 1972 | |
| Brown-headed Cowbird | Icteridae | 2 | 1994 | -40% | 1974 | |
| Eastern Meadowlark | Icteridae | 2 | 1993 | -78% | 1972 | |
| Purple Finch | Fringillidae | 2 | 1992 | -25% | 1982 | |
| American Goldfinch | Fringillidae | 2 | 1994 | +16% | 1972 | |
| Eastern Towhee | Passerellidae | 2 | 1994 | -42% | 1972 | |
| Cedar Waxwing | Bombycillidae | 2 | 1992 | +125% | 1974 | |
| Yellow Warbler | Parulidae | 2 | 1994 | -67% | 1972 | |
| Green Heron | Ardeidae | 2 | 1992 | -20% | 1977 | |
| Belted Kingfisher | Alcedinidae | 2 | 1990 | +100% | 1977 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.