BBS Route · Texas · BCR 35
Marathon Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 73 species recorded across 19 survey years, still active.
73Species Recorded
19Years Surveyed
2004–2023Span
1Observers
Bird Species Found on Texas Marathon
Top 40 of 73 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Northern Mockingbird | Mimidae | 48 | 2023 | -48% | 2006 | |
| Cassin's Sparrow | Passerellidae | 47 | 2023 | -64% | 2006 | |
| Mourning Dove | Columbidae | 42 | 2023 | +177% | 2006 | |
| Cactus Wren | Troglodytidae | 13 | 2023 | -68% | 2006 | |
| Scissor-tailed Flycatcher | Tyrannidae | 12 | 2023 | +52% | 2006 | |
| Brown-headed Cowbird | Icteridae | 12 | 2022 | +44% | 2006 | |
| House Finch | Fringillidae | 12 | 2023 | +130% | 2006 | |
| Barn Swallow | Hirundinidae | 12 | 2023 | +21% | 2006 | |
| House Sparrow | Passeridae | 11 | 2023 | -8% | 2006 | |
| Scaled Quail | Odontophoridae | 10 | 2023 | -49% | 2006 | |
| Black-throated Sparrow | Passerellidae | 10 | 2023 | +56% | 2006 | |
| Turkey Vulture | Cathartidae | 9 | 2023 | -29% | 2006 | |
| Ash-throated Flycatcher | Tyrannidae | 8 | 2023 | -4% | 2006 | |
| Blue Grosbeak | Cardinalidae | 7 | 2023 | -23% | 2006 | |
| Eurasian Collared-Dove | Columbidae | 6 | 2023 | +250% | 2006 | |
| Loggerhead Shrike | Laniidae | 6 | 2023 | +18% | 2007 | |
| Cassin's Kingbird | Tyrannidae | 4 | 2023 | -33% | 2006 | |
| Bell's Vireo | Vireonidae | 4 | 2023 | +120% | 2007 | |
| Northern Cardinal | Cardinalidae | 4 | 2023 | +0% | 2009 | |
| White-winged Dove | Columbidae | 3 | 2022 | +260% | 2006 | |
| Red-tailed Hawk | Accipitridae | 3 | 2023 | +75% | 2006 | |
| Chihuahuan Meadowlark | Icteridae | 3 | 2023 | -91% | 2006 | |
| Great-tailed Grackle | Icteridae | 3 | 2023 | +78% | 2006 | |
| Pyrrhuloxia | Cardinalidae | 3 | 2023 | -53% | 2006 | |
| Curve-billed Thrasher | Mimidae | 3 | 2023 | -56% | 2006 | |
| Swainson's Hawk | Accipitridae | 3 | 2023 | -63% | 2007 | |
| Great Horned Owl | Strigidae | 3 | 2016 | +33% | 2007 | |
| Mallard | Anatidae | 3 | 2016 | +0% | 2007 | |
| Bronzed Cowbird | Icteridae | 3 | 2011 | n/a | n/a | |
| Burrowing Owl | Strigidae | 2 | 2023 | +144% | 2006 | |
| Common Nighthawk | Caprimulgidae | 2 | 2023 | -75% | 2006 | |
| Western Kingbird | Tyrannidae | 2 | 2023 | -83% | 2006 | |
| Scott's Oriole | Icteridae | 2 | 2023 | -22% | 2006 | |
| Orchard Oriole | Icteridae | 2 | 2022 | -20% | 2006 | |
| Bullock's Oriole | Icteridae | 2 | 2023 | -33% | 2009 | |
| Lark Sparrow | Passerellidae | 2 | 2023 | -89% | 2006 | |
| Varied Bunting | Cardinalidae | 2 | 2010 | +100% | 2004 | |
| Ladder-backed Woodpecker | Picidae | 2 | 2023 | -29% | 2011 | |
| Summer Tanager | Cardinalidae | 2 | 2023 | +0% | 2007 | |
| Common Raven | Corvidae | 2 | 2023 | +14% | 2009 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.