BBS Route · California · BCR 32
Oilfields Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 55 species recorded across 19 survey years, still active.
55Species Recorded
19Years Surveyed
1968–2013Span
8Observers
Bird Species Found on California Oilfields
Top 40 of 55 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Brewer's Blackbird | Icteridae | 190 | 2013 | +31% | 1970 | |
| Cliff Swallow | Hirundinidae | 89 | 2013 | -59% | 1970 | |
| Northern Rough-winged Swallow | Hirundinidae | 77 | 2005 | n/a | n/a | |
| Mourning Dove | Columbidae | 70 | 2013 | +29% | 1970 | |
| House Sparrow | Passeridae | 57 | 2013 | -68% | 1970 | |
| Tricolored Blackbird | Icteridae | 56 | 1976 | +287% | 1969 | |
| Common Raven | Corvidae | 45 | 2013 | +202% | 1997 | |
| American Avocet | Recurvirostridae | 36 | 1998 | +350% | 1970 | |
| House Finch | Fringillidae | 27 | 2013 | +350% | 1970 | |
| Red-winged Blackbird | Icteridae | 16 | 2013 | -88% | 1970 | |
| Burrowing Owl | Strigidae | 15 | 1981 | +380% | 1971 | |
| American Crow | Corvidae | 14 | 2013 | +562% | 1970 | |
| Black-necked Stilt | Recurvirostridae | 12 | 1998 | -65% | 1976 | |
| Barn Swallow | Hirundinidae | 12 | 2013 | +467% | 1975 | |
| Lawrence's Goldfinch | Fringillidae | 12 | 2000 | 12× | 1981 | |
| American Robin | Turdidae | 11 | 2005 | +59% | 1975 | |
| Rock Pigeon | Columbidae | 10 | 2013 | +200% | 1976 | |
| Brown-headed Cowbird | Icteridae | 10 | 2005 | -73% | 1974 | |
| Horned Lark | Alaudidae | 9 | 2012 | -86% | 1970 | |
| Northern Mockingbird | Mimidae | 8 | 2005 | +100% | 1971 | |
| Savannah Sparrow | Passerellidae | 8 | 2005 | +175% | 1998 | |
| Northern Harrier | Accipitridae | 6 | 1999 | +86% | 1981 | |
| Killdeer | Charadriidae | 5 | 2013 | +90% | 1972 | |
| Ring-necked Pheasant | Phasianidae | 4 | 1981 | -41% | 1970 | |
| Western Meadowlark | Icteridae | 4 | 2013 | -69% | 1970 | |
| California Quail | Odontophoridae | 4 | 2000 | -69% | 1971 | |
| Lesser Goldfinch | Fringillidae | 4 | 2005 | +83% | 1980 | |
| Mallard | Anatidae | 4 | 2012 | +33% | 1981 | |
| Western Kingbird | Tyrannidae | 3 | 2013 | +155% | 1970 | |
| Loggerhead Shrike | Laniidae | 3 | 2005 | +17% | 1975 | |
| Black Phoebe | Tyrannidae | 3 | 1998 | n/a | n/a | |
| Tree Swallow | Hirundinidae | 3 | 2005 | n/a | n/a | |
| American Kestrel | Falconidae | 2 | 2005 | +0% | 1972 | |
| Anna's Hummingbird | Trochilidae | 2 | 2005 | +0% | 1980 | |
| Northern Pintail | Anatidae | 2 | 1975 | +0% | 1973 | |
| Bullock's Oriole | Icteridae | 2 | 1981 | +0% | 1974 | |
| Ruddy Duck | Anatidae | 2 | 1976 | n/a | n/a | |
| American Goldfinch | Fringillidae | 2 | 1978 | n/a | n/a | |
| American Bittern | Ardeidae | 1 | 1968 | n/a | n/a | |
| Ash-throated Flycatcher | Tyrannidae | 1 | 2000 | +0% | 1968 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.