60 birds were recorded seen in Washington in May in our iNaturalist sample; 24 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in May

Mallard

American Robin
Canada Goose

Great Blue Heron

Dark-eyed Junco

Song Sparrow
Red-winged Blackbird

Bald Eagle

American Crow

Spotted Towhee
Anna's Hummingbird

White-crowned Sparrow
All birds seen in Washington in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 2,574 | Apr (past peak) |
| 2 | American Robin | Turdus migratorius | Thrushes | 2,525 | Apr (past peak) |
| 3 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 2,329 | Apr (past peak) |
| 4 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 2,066 | May (peak) |
| 5 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 1,983 | May (peak) |
| 6 | Song Sparrow | Melospiza melodia | New World Sparrows | 1,852 | Apr (past peak) |
| 7 | Red-winged Blackbird | Agelaius phoeniceus | New World Blackbirds and Orioles | 1,830 | Apr (past peak) |
| 8 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 1,810 | Apr (past peak) |
| 9 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 1,768 | Apr (past peak) |
| 10 | Spotted Towhee | Pipilo maculatus | New World Sparrows | 1,255 | Apr (past peak) |
| 11 | Anna's Hummingbird | Calypte anna | Hummingbirds | 1,013 | Apr (past peak) |
| 12 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 990 | Apr (past peak) |
| 13 | Black-headed Grosbeak | Pheucticus melanocephalus | Cardinals and Allies | 983 | May (peak) |
| 14 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 951 | May (peak) |
| 15 | Osprey | Pandion haliaetus | Ospreys | 856 | Aug (rising) |
| 16 | Steller's Jay | Cyanocitta stelleri | Crows, Jays, and Magpies | 827 | May (peak) |
| 17 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 825 | May (peak) |
| 18 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 799 | May (peak) |
| 19 | Northern Flicker | Colaptes auratus | Woodpeckers | 794 | Jun (rising) |
| 20 | Barn Swallow | Hirundo rustica | Swallows and Martins | 764 | Jul (rising) |
| 21 | Tree Swallow | Tachycineta bicolor | Swallows and Martins | 763 | May (peak) |
| 22 | Gadwall | Mareca strepera | Ducks, Geese, and Swans | 743 | May (peak) |
| 23 | European Starling | Sturnus vulgaris | Starlings | 742 | May (peak) |
| 24 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 719 | Jun (rising) |
| 25 | Violet-green Swallow | Tachycineta thalassina | Swallows and Martins | 667 | May (peak) |
| 26 | Brown-headed Cowbird | Molothrus ater | New World Blackbirds and Orioles | 619 | May (peak) |
| 27 | Cedar Waxwing | Bombycilla cedrorum | Waxwings | 608 | Jun (rising) |
| 28 | Western Tanager | Piranga ludoviciana | Cardinals and Allies | 590 | May (peak) |
| 29 | Barred Owl | Strix varia | Typical Owls | 585 | Jul (rising) |
| 30 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 533 | Mar (past peak) |
| 31 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 529 | Apr (past peak) |
| 32 | Wilson's Warbler | Cardellina pusilla | New World Warblers | 526 | May (peak) |
| 33 | Pigeon Guillemot | Cepphus columba | Auks, Murres, and Puffins | 510 | Jul (rising) |
| 34 | Rufous Hummingbird | Selasphorus rufus | Hummingbirds | 503 | May (peak) |
| 35 | House Sparrow | Passer domesticus | Old World Sparrows | 495 | May (peak) |
| 36 | Savannah Sparrow | Passerculus sandwichensis | New World Sparrows | 459 | Apr (past peak) |
| 37 | Cinnamon Teal | Spatula cyanoptera | Ducks, Geese, and Swans | 389 | May (peak) |
| 38 | Turkey Vulture | Cathartes aura | New World Vultures | 377 | May (peak) |
| 39 | Red-breasted Sapsucker | Sphyrapicus ruber | Woodpeckers | 377 | Jun (rising) |
| 40 | Pileated Woodpecker | Dryocopus pileatus | Woodpeckers | 362 | May (peak) |
| 41 | Hairy Woodpecker | Leuconotopicus villosus | Woodpeckers | 360 | Jun (rising) |
| 42 | Chestnut-backed Chickadee | Poecile rufescens | Tits, Chickadees, and Titmice | 359 | Apr (past peak) |
| 43 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 357 | Apr (past peak) |
| 44 | Yellow-headed Blackbird | Xanthocephalus xanthocephalus | New World Blackbirds and Orioles | 355 | May (peak) |
| 45 | California Scrub-Jay | Aphelocoma californica | Crows, Jays, and Magpies | 352 | May (peak) |
| 46 | Bewick's Wren | Thryomanes bewickii | Wrens | 346 | Apr (past peak) |
| 47 | Northern Yellow Warbler | Setophaga aestiva | New World Warblers | 344 | May (peak) |
| 48 | Caspian Tern | Hydroprogne caspia | Gulls, Terns, and Skimmers | 335 | May (peak) |
| 49 | California Quail | Callipepla californica | New World Quails | 328 | May (peak) |
| 50 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 325 | Mar (past peak) |