60 birds were recorded seen in Missouri in August in our iNaturalist sample; 3 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in August

Ruby-throated Hummingbird

American Goldfinch

Great Blue Heron

Northern Cardinal

Mourning Dove

Great Egret

Green Heron

Red-tailed Hawk

Turkey Vulture

Indigo Bunting

Mallard

House Sparrow
All birds seen in Missouri in August
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 473 | Sep (rising) |
| 2 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 302 | Apr (past peak) |
| 3 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 286 | May (past peak) |
| 4 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 274 | Apr (past peak) |
| 5 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 222 | Apr (past peak) |
| 6 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 208 | Apr (past peak) |
| 7 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 185 | Aug (peak) |
| 8 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 179 | Nov (rising) |
| 9 | Turkey Vulture | Cathartes aura | New World Vultures | 177 | Apr (past peak) |
| 10 | Indigo Bunting | Passerina cyanea | Cardinals and Allies | 175 | May (past peak) |
| 11 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 172 | Apr (past peak) |
| 12 | House Sparrow | Passer domesticus | Old World Sparrows | 161 | May (past peak) |
| 13 | Mississippi Kite | Ictinia mississippiensis | Hawks, Eagles, and Kites | 154 | Aug (peak) |
| 14 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 145 | Apr (past peak) |
| 15 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 144 | Apr (past peak) |
| 16 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 133 | Apr (past peak) |
| 17 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 129 | May (past peak) |
| 18 | American Robin | Turdus migratorius | Thrushes | 122 | Apr (past peak) |
| 19 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 110 | Mar (past peak) |
| 20 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 100 | Apr (past peak) |
| 21 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 100 | Sep (rising) |
| 22 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 96 | May (past peak) |
| 23 | Eastern Kingbird | Tyrannus tyrannus | Tyrant Flycatchers | 93 | May (past peak) |
| 24 | Eastern Bluebird | Sialia sialis | Thrushes | 85 | Apr (past peak) |
| 25 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 84 | Apr (past peak) |
| 26 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 84 | Mar (past peak) |
| 27 | Barred Owl | Strix varia | Typical Owls | 83 | Apr (past peak) |
| 28 | Barn Swallow | Hirundo rustica | Swallows and Martins | 81 | May (past peak) |
| 29 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 79 | Jan (past peak) |
| 30 | Carolina Wren | Thryothorus ludovicianus | Wrens | 77 | Apr (past peak) |
| 31 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 77 | Apr (past peak) |
| 32 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 69 | Apr (past peak) |
| 33 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 67 | Apr (past peak) |
| 34 | European Starling | Sturnus vulgaris | Starlings | 64 | May (past peak) |
| 35 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 62 | Mar (past peak) |
| 36 | Red-headed Woodpecker | Melanerpes erythrocephalus | Woodpeckers | 62 | May (past peak) |
| 37 | Little Blue Heron | Egretta caerulea | Herons, Egrets, and Bitterns | 57 | May (past peak) |
| 38 | Northern Flicker | Colaptes auratus | Woodpeckers | 51 | Mar (past peak) |
| 39 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 50 | Aug (peak) |
| 40 | Red-winged Blackbird | Agelaius phoeniceus | New World Blackbirds and Orioles | 48 | May (past peak) |
| 41 | Dickcissel | Spiza americana | Cardinals and Allies | 47 | May (past peak) |
| 42 | Yellow-billed Cuckoo | Coccyzus americanus | Cuckoos | 44 | May (past peak) |
| 43 | Great Horned Owl | Bubo virginianus | Typical Owls | 44 | Apr (past peak) |
| 44 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 43 | Mar (past peak) |
| 45 | Yellow-crowned Night Heron | Nyctanassa violacea | Herons, Egrets, and Bitterns | 43 | May (past peak) |
| 46 | Chipping Sparrow | Spizella passerina | New World Sparrows | 42 | Apr (past peak) |
| 47 | Common Grackle | Quiscalus quiscula | New World Blackbirds and Orioles | 42 | May (past peak) |
| 48 | Least Sandpiper | Calidris minutilla | Sandpipers and Allies | 41 | May (past peak) |
| 49 | Song Sparrow | Melospiza melodia | New World Sparrows | 41 | Mar (past peak) |
| 50 | Solitary Sandpiper | Tringa solitaria | Sandpipers and Allies | 39 | Apr (past peak) |