BBS Route · Texas · BCR 21
Thornton 2 Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 83 species recorded across 25 survey years, no longer active.
83Species Recorded
25Years Surveyed
1985–2010Span
3Observers
Bird Species Found on Texas Thornton 2
Top 40 of 83 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Northern Cardinal | Cardinalidae | 110 | 2010 | +118% | 1987 | |
| Painted Bunting | Cardinalidae | 49 | 2010 | +187% | 1987 | |
| Barn Swallow | Hirundinidae | 49 | 2010 | -8% | 1987 | |
| Northern Mockingbird | Mimidae | 40 | 2010 | +0% | 1987 | |
| Cliff Swallow | Hirundinidae | 38 | 2010 | +571% | 1992 | |
| Turkey Vulture | Cathartidae | 32 | 2010 | +64% | 1987 | |
| House Sparrow | Passeridae | 29 | 2010 | +34% | 1987 | |
| American Crow | Corvidae | 28 | 2010 | +26% | 1987 | |
| Scissor-tailed Flycatcher | Tyrannidae | 25 | 2010 | +40% | 1987 | |
| Carolina Chickadee | Paridae | 21 | 2010 | +239% | 1987 | |
| Cave Swallow | Hirundinidae | 19 | 2010 | +162% | 2004 | |
| Eurasian Collared-Dove | Columbidae | 16 | 2010 | +300% | 2009 | |
| Yellow-billed Cuckoo | Cuculidae | 14 | 2010 | +46% | 1987 | |
| Brown-headed Cowbird | Icteridae | 14 | 2010 | +27% | 1987 | |
| Mourning Dove | Columbidae | 13 | 2010 | +24% | 1987 | |
| Tufted Titmouse | Paridae | 13 | 2010 | +7% | 1988 | |
| Great-tailed Grackle | Icteridae | 12 | 2010 | +5% | 1987 | |
| Carolina Wren | Troglodytidae | 12 | 2010 | +140% | 1987 | |
| Killdeer | Charadriidae | 11 | 2010 | +320% | 1992 | |
| Eastern Phoebe | Tyrannidae | 10 | 2010 | +480% | 1991 | |
| Black Vulture | Cathartidae | 9 | 2010 | -8% | 1987 | |
| Red-bellied Woodpecker | Picidae | 9 | 2010 | +26% | 1987 | |
| Eastern Meadowlark | Icteridae | 8 | 2010 | -77% | 1987 | |
| White-eyed Vireo | Vireonidae | 8 | 2010 | +513% | 1988 | |
| Northern Rough-winged Swallow | Hirundinidae | 8 | 2010 | +500% | 1998 | |
| Common Grackle | Icteridae | 7 | 2010 | -84% | 1987 | |
| Western Kingbird | Tyrannidae | 6 | 2010 | +260% | 1988 | |
| Great Crested Flycatcher | Tyrannidae | 6 | 2010 | +80% | 1987 | |
| Lark Sparrow | Passerellidae | 6 | 2009 | -10% | 1987 | |
| Eastern Bluebird | Turdidae | 5 | 2010 | -24% | 1987 | |
| Eastern Kingbird | Tyrannidae | 5 | 2001 | +67% | 1991 | |
| Grasshopper Sparrow | Passerellidae | 5 | 2010 | +129% | 1999 | |
| Purple Martin | Hirundinidae | 4 | 2008 | -38% | 1988 | |
| Dickcissel | Cardinalidae | 4 | 2010 | -65% | 1989 | |
| Blue-gray Gnatcatcher | Polioptilidae | 4 | 2004 | +100% | 2000 | |
| Western Cattle-Egret | Ardeidae | 3 | 2010 | -53% | 1987 | |
| American Robin | Turdidae | 3 | 2010 | +125% | 1989 | |
| Yellow-throated Vireo | Vireonidae | 3 | 2010 | -33% | 2000 | |
| Bank Swallow | Hirundinidae | 3 | 2009 | -89% | 2003 | |
| Red-tailed Hawk | Accipitridae | 2 | 2010 | +50% | 1987 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.