BBS Route · Pennsylvania · BCR 28
Mars Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 110 species recorded across 22 survey years, still active.
110Species Recorded
22Years Surveyed
1989–2024Span
6Observers
Bird Species Found on Pennsylvania Mars
Top 40 of 110 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| American Robin | Turdidae | 79 | 2024 | -49% | 1991 | |
| European Starling | Sturnidae | 48 | 2024 | -75% | 1991 | |
| American Crow | Corvidae | 40 | 2024 | -28% | 1991 | |
| Red-winged Blackbird | Icteridae | 39 | 2024 | -82% | 1991 | |
| Mourning Dove | Columbidae | 33 | 2024 | -59% | 1991 | |
| Song Sparrow | Passerellidae | 30 | 2024 | -52% | 1991 | |
| Common Grackle | Icteridae | 29 | 2024 | -73% | 1991 | |
| Northern Cardinal | Cardinalidae | 27 | 2024 | -27% | 1991 | |
| Barn Swallow | Hirundinidae | 24 | 2024 | -53% | 1991 | |
| Blue Jay | Corvidae | 19 | 2024 | -4% | 1991 | |
| American Goldfinch | Fringillidae | 19 | 2024 | -38% | 1991 | |
| Red-eyed Vireo | Vireonidae | 18 | 2024 | -51% | 1991 | |
| Chipping Sparrow | Passerellidae | 15 | 2024 | -65% | 1991 | |
| Tufted Titmouse | Paridae | 15 | 2024 | +62% | 1991 | |
| Carolina Wren | Troglodytidae | 14 | 2024 | +79% | 1991 | |
| Red-bellied Woodpecker | Picidae | 13 | 2024 | +95% | 1991 | |
| Eastern Towhee | Passerellidae | 12 | 2024 | -54% | 1991 | |
| Indigo Bunting | Cardinalidae | 12 | 2024 | -59% | 1991 | |
| House Sparrow | Passeridae | 12 | 2024 | -82% | 1991 | |
| Gray Catbird | Mimidae | 12 | 2024 | -69% | 1991 | |
| House Finch | Fringillidae | 11 | 2024 | -44% | 1991 | |
| Brown-headed Cowbird | Icteridae | 10 | 2024 | -7% | 1991 | |
| Yellow Warbler | Parulidae | 7 | 2024 | -55% | 1991 | |
| Northern House Wren | Troglodytidae | 7 | 2024 | -54% | 1991 | |
| Wood Thrush | Turdidae | 7 | 2024 | -81% | 1991 | |
| Chimney Swift | Apodidae | 6 | 2024 | -60% | 1991 | |
| Northern Mockingbird | Mimidae | 6 | 2024 | +567% | 2006 | |
| Killdeer | Charadriidae | 5 | 2024 | -36% | 1991 | |
| White-breasted Nuthatch | Sittidae | 5 | 2024 | -21% | 1991 | |
| Rock Pigeon | Columbidae | 5 | 2024 | -43% | 1992 | |
| Prairie Warbler | Parulidae | 5 | 1995 | +14% | 1992 | |
| Eastern Phoebe | Tyrannidae | 4 | 2024 | -71% | 1991 | |
| Eastern Wood-Pewee | Tyrannidae | 4 | 2024 | -47% | 1991 | |
| Eastern Meadowlark | Icteridae | 4 | 2024 | -73% | 1991 | |
| Scarlet Tanager | Cardinalidae | 4 | 2024 | -54% | 1993 | |
| Eastern Bluebird | Turdidae | 4 | 2024 | -59% | 1991 | |
| Bank Swallow | Hirundinidae | 4 | 1995 | -8% | 1993 | |
| Acadian Flycatcher | Tyrannidae | 3 | 2024 | -58% | 1991 | |
| Yellow-throated Vireo | Vireonidae | 3 | 2023 | -14% | 1993 | |
| Wild Turkey | Phasianidae | 3 | 2023 | +50% | 2009 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.