BirdAnalyst
Bird Conservation Region 21

Oaks and Prairies

An ecological region spanning Oklahoma, Texas, with 74 survey routes. BCRs are the natural unit for bird trends.

What Is Moving HereNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Loggerhead Shrike has collapsed in Oaks and Prairies: down 95% on the route-weighted index since 1969.

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Eurasian Collared-Dove has surged in Oaks and Prairies: up 84× on the route-weighted index since 2002.

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Red-headed Woodpecker has collapsed in Oaks and Prairies: down 94% on the route-weighted index since 1969.

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

White-winged Dove has surged in Oaks and Prairies: up 42× on the route-weighted index since 1977.

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Rufous-crowned Sparrow has collapsed in Oaks and Prairies: down 93% on the route-weighted index since 1969.

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Black Vulture has surged in Oaks and Prairies: up 21× on the route-weighted index since 1969.

How Guilds Are FaringGuild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology →

-88%

Game birds

3 species
-70%

Shorebirds

2 species
-59%

Grassland birds

9 species
-54%

Generalists

16 species
-45%

Arid-land birds

7 species
-4%

Aerial insectivores

25 species
+24%

Forest birds

59 species
+31%

Wetland birds

20 species
+105%

Birds of prey

17 species
+570%

Waterfowl

6 species

Survey Routes

Species By FamilyTrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →

Hawks, Eagles & Kites Accipitridae

Broad-winged Hawk +30%Cooper's Hawk +90%Harris's Hawk +9%Mississippi Kite +676%Northern Harrier -8%Red-shouldered Hawk +562%Red-tailed Hawk +88%Swainson's Hawk -9%White-tailed Hawk +14%White-tailed Kite -68%

Larks Alaudidae

Horned Lark -92%

Kingfishers Alcedinidae

Belted Kingfisher -83%

Ducks, Geese & Waterfowl Anatidae

Black-bellied Whistling-Duck 13×Blue-winged Teal -78%Canada Goose +304%Mallard +3%Mottled Duck -7%Wood Duck +103%

Anhingas Anhingidae

Anhinga -37%

Swifts Apodidae

Chimney Swift -87%

Herons, Egrets & Bitterns Ardeidae

Black-crowned Night Heron -59%Great Blue Heron +53%Great Egret +31%Green Heron -49%Little Blue Heron -52%Snowy Egret +641%Tricolored Heron +1%Western Cattle-Egret +835%Yellow-crowned Night Heron -15%

Nightjars & Nighthawks Caprimulgidae

Chuck-will's-widow -23%Common Nighthawk -68%Common Pauraque +27%Common Poorwill -42%Eastern Whip-poor-will -66%Lesser Nighthawk -86%

Cardinals & Grosbeaks Cardinalidae

Blue Grosbeak -16%Dickcissel -37%Indigo Bunting +76%Northern Cardinal +76%Painted Bunting +24%Pyrrhuloxia -11%Summer Tanager +172%

New World Vultures Cathartidae

Black Vulture 21×Turkey Vulture +36%

Plovers & Lapwings Charadriidae

Killdeer -70%

Storks Ciconiidae

Wood Stork +112%

Pigeons & Doves Columbidae

Common Ground Dove -13%Eurasian Collared-Dove 84×Inca Dove +269%Mourning Dove -22%Rock Pigeon -87%White-winged Dove 42×

Crows, Jays & Magpies Corvidae

American Crow +16%Blue Jay +5%Chihuahuan Raven -54%Fish Crow +192%Green Jay +119%

Cuckoos, Roadrunners & Anis Cuculidae

Greater Roadrunner +32%Yellow-billed Cuckoo -36%

Falcons & Caracaras Falconidae

American Kestrel -27%Crested Caracara 13×

Finches Fringillidae

American Goldfinch -81%House Finch 19×Lesser Goldfinch -51%

Swallows & Martins Hirundinidae

Bank Swallow -10%Barn Swallow +100%Cave Swallow -54%Cliff Swallow +279%Northern Rough-winged Swallow +82%Purple Martin +66%

Blackbirds & Orioles Icteridae

Audubon's Oriole -24%Baltimore Oriole -75%Bronzed Cowbird +177%Brown-headed Cowbird -61%Bullock's Oriole +9%Common Grackle +91%Eastern Meadowlark -77%Great-tailed Grackle +18%Orchard Oriole -92%Red-winged Blackbird -39%Western Meadowlark -92%

Yellow-breasted Chat Icteriidae

Yellow-breasted Chat -50%

Shrikes Laniidae

Loggerhead Shrike -95%

Mockingbirds & Thrashers Mimidae

Brown Thrasher -86%Curve-billed Thrasher -78%Gray Catbird -67%Long-billed Thrasher +449%Northern Mockingbird -37%

New World Quail Odontophoridae

Northern Bobwhite -91%Scaled Quail -93%

Chickadees & Titmice Paridae

Black-crested Titmouse +240%Carolina Chickadee +132%Tufted Titmouse +77%

Wood-Warblers Parulidae

Black-and-white Warbler +221%Common Yellowthroat -64%Hooded Warbler +17%Kentucky Warbler -0%Louisiana Waterthrush +99%Northern Parula +306%Pine Warbler +468%Prothonotary Warbler +99%Swainson's Warbler +166%Yellow Warbler -66%Yellow-throated Warbler +360%

New World Sparrows Passerellidae

Black-throated Sparrow -63%Canyon Towhee -15%Cassin's Sparrow +64%Chipping Sparrow -14%Field Sparrow -85%Grasshopper Sparrow -60%Lark Sparrow -73%Olive Sparrow 13×Rufous-crowned Sparrow -93%

Old World Sparrows Passeridae

House Sparrow -83%

Cormorants Phalacrocoracidae

Double-crested Cormorant -52%Neotropic Cormorant +345%

Pheasants, Grouse & Turkeys Phasianidae

Wild Turkey +670%

Woodpeckers Picidae

Downy Woodpecker +74%Golden-fronted Woodpecker +837%Hairy Woodpecker +132%Ladder-backed Woodpecker +22%Pileated Woodpecker +435%Red-bellied Woodpecker +65%Red-headed Woodpecker -94%

Grebes Podicipedidae

Pied-billed Grebe -44%

Gnatcatchers Polioptilidae

Blue-gray Gnatcatcher +165%

Rails, Gallinules & Coots Rallidae

American Coot -46%Common Gallinule +17%

Avocets & Stilts Recurvirostridae

Black-necked Stilt +221%

Penduline Tits Remizidae

Verdin +100%

Sandpipers & Allies Scolopacidae

Upland Sandpiper -71%

Nuthatches Sittidae

White-breasted Nuthatch +411%

Owls Strigidae

Barred Owl +80%Eastern Screech-Owl -55%Great Horned Owl +3%

Starlings & Mynas Sturnidae

European Starling +22%

Ibises & Spoonbills Threskiornithidae

White Ibis 16×

Hummingbirds Trochilidae

Black-chinned Hummingbird +48%Ruby-throated Hummingbird -40%

Wrens Troglodytidae

Bewick's Wren -22%Cactus Wren -59%Canyon Wren -63%Carolina Wren +530%Northern House Wren -49%

Thrushes Turdidae

American Robin -56%Eastern Bluebird -35%Wood Thrush -80%

Tyrant Flycatchers Tyrannidae

Acadian Flycatcher +14%Ash-throated Flycatcher +485%Brown-crested Flycatcher +891%Couch's Kingbird +940%Eastern Kingbird -59%Eastern Phoebe +121%Eastern Wood-Pewee -35%Great Crested Flycatcher -42%Great Kiskadee +396%Scissor-tailed Flycatcher -50%Vermilion Flycatcher +12%Western Kingbird +615%

Vireos Vireonidae

Bell's Vireo -50%Red-eyed Vireo +165%Warbling Vireo -32%White-eyed Vireo 16×Yellow-throated Vireo +542%

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.