BirdAnalyst
Bird Conservation Region 34

Sierra Madre Occidental

An ecological region spanning Arizona, New-mexico, with 36 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 →

Lewis's Woodpecker has collapsed in Sierra Madre Occidental: down 96% on the route-weighted index since 1970.

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 Sierra Madre Occidental: up 723% on the route-weighted index since 2005.

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 →

Brewer's Sparrow has collapsed in Sierra Madre Occidental: down 96% on the route-weighted index since 1989.

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 →

Western Tanager has surged in Sierra Madre Occidental: up 674% on the route-weighted index since 1970.

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 →

Killdeer has collapsed in Sierra Madre Occidental: down 93% on the route-weighted index since 1970.

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 →

Ruby-crowned Kinglet has surged in Sierra Madre Occidental: up 656% on the route-weighted index since 1975.

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 →

-93%

Shorebirds

2 species
-85%

Wetland birds

7 species
-65%

Waterfowl

3 species
-56%

Arid-land birds

18 species
-52%

Birds of prey

20 species
-46%

Grassland birds

9 species
-34%

Generalists

16 species
-33%

Aerial insectivores

27 species
-28%

Game birds

4 species
-14%

Forest birds

82 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

American Goshawk -42%Cooper's Hawk -53%Golden Eagle -74%Gray Hawk +316%Red-tailed Hawk +72%Sharp-shinned Hawk -75%Swainson's Hawk +527%Zone-tailed Hawk -39%

Bushtits Aegithalidae

Bushtit +10%

Larks Alaudidae

Horned Lark -15%

Ducks, Geese & Waterfowl Anatidae

Black-bellied Whistling-Duck -50%Cinnamon Teal -73%Mallard -63%

Swifts Apodidae

White-throated Swift +37%

Herons, Egrets & Bitterns Ardeidae

Great Blue Heron +23%

Nightjars & Nighthawks Caprimulgidae

Common Nighthawk -73%Common Poorwill -71%Lesser Nighthawk +14%Mexican Whip-poor-will +22%

Cardinals & Grosbeaks Cardinalidae

Black-headed Grosbeak +61%Blue Grosbeak +25%Hepatic Tanager +102%Indigo Bunting -73%Lazuli Bunting -89%Northern Cardinal +28%Pyrrhuloxia +78%Summer Tanager +14%Varied Bunting -33%Western Tanager +674%

New World Vultures Cathartidae

Black Vulture +277%Turkey Vulture -36%

Treecreepers Certhiidae

Brown Creeper +6%

Plovers & Lapwings Charadriidae

Killdeer -93%

Pigeons & Doves Columbidae

Band-tailed Pigeon +10%Common Ground Dove -62%Eurasian Collared-Dove +724%Inca Dove -81%Mourning Dove -26%Rock Pigeon -72%White-winged Dove -20%

Crows, Jays & Magpies Corvidae

American Crow +11%Chihuahuan Raven -85%Clark's Nutcracker +7%Common Raven +499%Mexican Jay -53%Pinyon Jay -46%Steller's Jay +3%Woodhouse's Scrub-Jay +618%

Cuckoos, Roadrunners & Anis Cuculidae

Greater Roadrunner -50%Yellow-billed Cuckoo -79%

Falcons & Caracaras Falconidae

American Kestrel -48%Peregrine Falcon -73%Prairie Falcon -75%

Finches Fringillidae

House Finch -44%Lesser Goldfinch +52%Pine Siskin -8%Red Crossbill -48%

Swallows & Martins Hirundinidae

Barn Swallow +77%Cliff Swallow -69%Northern Rough-winged Swallow -86%Purple Martin +170%Tree Swallow -68%Violet-green Swallow +23%

Blackbirds & Orioles Icteridae

Brewer's Blackbird -76%Bronzed Cowbird -72%Brown-headed Cowbird -66%Bullock's Oriole +85%Chihuahuan Meadowlark -66%Great-tailed Grackle -89%Hooded Oriole -20%Red-winged Blackbird -81%Scott's Oriole -34%Western Meadowlark +29%Yellow-headed Blackbird -80%

Yellow-breasted Chat Icteriidae

Yellow-breasted Chat -35%

Shrikes Laniidae

Loggerhead Shrike -60%

Mockingbirds & Thrashers Mimidae

Bendire's Thrasher -69%Crissal Thrasher +61%Curve-billed Thrasher +84%Northern Mockingbird +11%

New World Quail Odontophoridae

Gambel's Quail +15%Montezuma Quail -34%Scaled Quail -37%

Osprey Pandionidae

Osprey +2%

Chickadees & Titmice Paridae

Bridled Titmouse -31%Juniper Titmouse +5%Mountain Chickadee -30%

Wood-Warblers Parulidae

Black-throated Gray Warbler +15%Common Yellowthroat -91%Grace's Warbler -23%Lucy's Warbler -43%MacGillivray's Warbler +27%Orange-crowned Warbler -87%Painted Redstart +10%Red-faced Warbler +243%Virginia's Warbler +27%Yellow Warbler +135%

New World Sparrows Passerellidae

Abert's Towhee +75%Black-chinned Sparrow -64%Black-throated Sparrow -57%Botteri's Sparrow +33%Brewer's Sparrow -96%Canyon Towhee -49%Cassin's Sparrow -79%Chipping Sparrow -13%Grasshopper Sparrow -68%Green-tailed Towhee +270%Lark Sparrow -12%Rufous-crowned Sparrow +130%Rufous-winged Sparrow +305%Song Sparrow +38%Spotted Towhee +570%Vesper Sparrow -45%Yellow-eyed Junco +136%

Old World Sparrows Passeridae

House Sparrow +24%

Olive Warbler Peucedramidae

Olive Warbler +301%

Cormorants Phalacrocoracidae

Double-crested Cormorant -43%

Pheasants, Grouse & Turkeys Phasianidae

Wild Turkey +54%

Woodpeckers Picidae

Acorn Woodpecker +42%American Three-toed Woodpecker -60%Arizona Woodpecker +48%Downy Woodpecker -84%Gila Woodpecker +77%Gilded Flicker +14%Hairy Woodpecker +31%Ladder-backed Woodpecker -50%Lewis's Woodpecker -96%Red-naped Sapsucker -49%Williamson's Sapsucker -41%

Grebes Podicipedidae

Pied-billed Grebe -70%

Gnatcatchers Polioptilidae

Black-tailed Gnatcatcher -18%Blue-gray Gnatcatcher +64%

Silky-flycatchers Ptiliogonatidae

Phainopepla -13%

Rails, Gallinules & Coots Rallidae

American Coot -81%

Kinglets Regulidae

Golden-crowned Kinglet -13%Ruby-crowned Kinglet +656%

Penduline Tits Remizidae

Verdin -16%

Sandpipers & Allies Scolopacidae

Spotted Sandpiper -67%

Nuthatches Sittidae

Pygmy Nuthatch -0%Red-breasted Nuthatch -24%White-breasted Nuthatch +120%

Owls Strigidae

Burrowing Owl -77%Elf Owl -70%Great Horned Owl -35%Northern Pygmy-Owl -65%Western Screech-Owl -87%

Starlings & Mynas Sturnidae

European Starling -85%

Hummingbirds Trochilidae

Anna's Hummingbird +3%Black-chinned Hummingbird -77%Blue-throated Mountain-gem -53%Broad-billed Hummingbird +31%Broad-tailed Hummingbird -38%Costa's Hummingbird -33%Rivoli's Hummingbird -77%

Wrens Troglodytidae

Bewick's Wren -62%Cactus Wren -3%Canyon Wren -24%Northern House Wren +635%Rock Wren +34%

Trogons Trogonidae

Elegant Trogon -66%

Thrushes Turdidae

American Robin +74%Eastern Bluebird -64%Hermit Thrush +50%Mountain Bluebird -26%Townsend's Solitaire -83%Western Bluebird -4%

Tyrant Flycatchers Tyrannidae

Ash-throated Flycatcher +25%Black Phoebe -34%Brown-crested Flycatcher +492%Cassin's Kingbird -35%Dusky Flycatcher +46%Dusky-capped Flycatcher +39%Gray Flycatcher +116%Greater Pewee +9%Northern Beardless-Tyrannulet -67%Olive-sided Flycatcher -56%Say's Phoebe -12%Sulphur-bellied Flycatcher -31%Thick-billed Kingbird +22%Vermilion Flycatcher +4%Western Kingbird -82%Western Wood-Pewee +49%

Barn-Owls Tytonidae

American Barn Owl -65%

Vireos Vireonidae

Bell's Vireo -18%Gray Vireo -11%Hutton's Vireo +42%Plumbeous Vireo +55%Warbling Vireo +230%

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