60 birds were recorded seen in Illinois in March in our iNaturalist sample; 13 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in March

American Robin
Canada Goose

Mallard

Northern Cardinal
Red-winged Blackbird

House Sparrow

Dark-eyed Junco

Song Sparrow

Red-breasted Merganser
Downy Woodpecker

Mourning Dove

Ring-billed Gull
All birds seen in Illinois in March
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | American Robin | Turdus migratorius | Thrushes | 2,254 | Apr (rising) |
| 2 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 2,187 | Apr (rising) |
| 3 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 1,844 | Apr (rising) |
| 4 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 1,644 | Apr (rising) |
| 5 | Red-winged Blackbird | Agelaius phoeniceus | New World Blackbirds and Orioles | 1,561 | Apr (rising) |
| 6 | House Sparrow | Passer domesticus | Old World Sparrows | 1,281 | Apr (rising) |
| 7 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 1,198 | Jan (past peak) |
| 8 | Song Sparrow | Melospiza melodia | New World Sparrows | 1,089 | Apr (rising) |
| 9 | Red-breasted Merganser | Mergus serrator | Ducks, Geese, and Swans | 962 | Mar (peak) |
| 10 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 907 | Apr (rising) |
| 11 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 847 | Apr (rising) |
| 12 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 825 | Mar (peak) |
| 13 | Common Grackle | Quiscalus quiscula | New World Blackbirds and Orioles | 819 | Apr (rising) |
| 14 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 766 | Feb (past peak) |
| 15 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 726 | Apr (rising) |
| 16 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 718 | Apr (rising) |
| 17 | American Tree Sparrow | Spizelloides arborea | New World Sparrows | 688 | Jan (past peak) |
| 18 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 635 | Apr (rising) |
| 19 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 584 | Apr (rising) |
| 20 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 584 | Feb (past peak) |
| 21 | Horned Grebe | Podiceps auritus | Grebes | 579 | Mar (peak) |
| 22 | Sandhill Crane | Antigone canadensis | Cranes | 564 | Mar (peak) |
| 23 | Lesser Scaup | Aythya affinis | Ducks, Geese, and Swans | 520 | Mar (peak) |
| 24 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 520 | Mar (peak) |
| 25 | Turkey Vulture | Cathartes aura | New World Vultures | 518 | Apr (rising) |
| 26 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 513 | May (rising) |
| 27 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 503 | Sep (rising) |
| 28 | European Starling | Sturnus vulgaris | Starlings | 489 | Apr (rising) |
| 29 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 473 | Apr (rising) |
| 30 | Northern Shoveler | Spatula clypeata | Ducks, Geese, and Swans | 454 | Mar (peak) |
| 31 | American Coot | Fulica americana | Rails, Gallinules, and Coots | 434 | Apr (rising) |
| 32 | Bufflehead | Bucephala albeola | Ducks, Geese, and Swans | 429 | Mar (peak) |
| 33 | Eastern Bluebird | Sialia sialis | Thrushes | 413 | May (rising) |
| 34 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 411 | Feb (past peak) |
| 35 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 404 | Apr (rising) |
| 36 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 390 | Aug (rising) |
| 37 | Ring-necked Duck | Aythya collaris | Ducks, Geese, and Swans | 383 | Mar (peak) |
| 38 | Hooded Merganser | Lophodytes cucullatus | Ducks, Geese, and Swans | 362 | Mar (peak) |
| 39 | Golden-crowned Kinglet | Regulus satrapa | Kinglets | 359 | Oct (rising) |
| 40 | Fox Sparrow | Passerella iliaca | New World Sparrows | 353 | Mar (peak) |
| 41 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 353 | Apr (rising) |
| 42 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 307 | Feb (past peak) |
| 43 | Common Goldeneye | Bucephala clangula | Ducks, Geese, and Swans | 297 | Jan (past peak) |
| 44 | Common Loon | Gavia immer | Loons | 292 | Mar (peak) |
| 45 | Northern Flicker | Colaptes auratus | Woodpeckers | 284 | Apr (rising) |
| 46 | Brown-headed Cowbird | Molothrus ater | New World Blackbirds and Orioles | 260 | Apr (rising) |
| 47 | Brown Creeper | Certhia americana | Treecreepers | 257 | Apr (rising) |
| 48 | Gadwall | Mareca strepera | Ducks, Geese, and Swans | 250 | Mar (peak) |
| 49 | Pied-billed Grebe | Podilymbus podiceps | Grebes | 233 | Apr (rising) |
| 50 | Blue-winged Teal | Spatula discors | Ducks, Geese, and Swans | 233 | Apr (rising) |