Bird Conservation Region 2
BCR 2
An ecological region spanning Alaska, with 24 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 →
Red-necked Grebe has collapsed in BCR 2: down 96% on the route-weighted index since 1994.
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-legged Kittiwake has surged in BCR 2: up 49× on the route-weighted index since 1990.
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 →
Long-tailed Duck has collapsed in BCR 2: down 93% on the route-weighted index since 1994.
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 →
Least Sandpiper has surged in BCR 2: up 636% on the route-weighted index since 1985.
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 →
Rusty Blackbird has collapsed in BCR 2: down 88% on the route-weighted index since 1987.
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 →
American Robin has surged in BCR 2: up 632% on the route-weighted index since 1985.
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 →
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
Kingfishers Alcedinidae
Ducks, Geese & Waterfowl Anatidae
American Wigeon -71%Black Scoter +25%Canada Goose -53%Canvasback +306%Common Eider +139%Common Goldeneye -76%Common Merganser -79%Greater Scaup +173%Green-winged Teal -80%Harlequin Duck -73%Long-tailed Duck -93%Mallard -70%Northern Pintail +33%Northern Shoveler -85%Red-breasted Merganser -69%Tundra Swan +190%White-winged Scoter -41%
Longspurs & Snow Buntings Calcariidae
Treecreepers Certhiidae
Plovers & Lapwings Charadriidae
Dippers Cinclidae
Crows, Jays & Magpies Corvidae
Finches Fringillidae
Cranes Gruidae
Oystercatchers Haematopodidae
Blackbirds & Orioles Icteridae
Shrikes Laniidae
Gulls, Terns & Skimmers Laridae
Wood-Warblers Parulidae
New World Sparrows Passerellidae
Cormorants Phalacrocoracidae
Leaf Warblers Phylloscopidae
Woodpeckers Picidae
Grebes Podicipedidae
Sandpipers & Allies Scolopacidae
Bar-tailed Godwit -19%Black Turnstone +28%Bristle-thighed Curlew -20%Dunlin +2%Greater Yellowlegs +71%Hudsonian Godwit +81%Least Sandpiper +636%Lesser Yellowlegs -80%Red-necked Phalarope +34%Ruddy Turnstone -48%Semipalmated Sandpiper +183%Short-billed Dowitcher -50%Spotted Sandpiper -50%Wandering Tattler -57%Western Sandpiper +218%Whimbrel -30%Wilson's Snipe -2%
Nuthatches Sittidae
Skuas & Jaegers Stercorariidae
Owls Strigidae
Wrens Troglodytidae
Thrushes Turdidae
Tyrant Flycatchers Tyrannidae
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.