60 birds were recorded seen in Maine in October in our iNaturalist sample; 6 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in October

American Herring Gull

Double-crested Cormorant

Great Blue Heron
Common Loon

Common Eider

Yellow-rumped Warbler

Song Sparrow

Black-capped Chickadee

Bald Eagle

White-throated Sparrow

Wild Turkey

Ring-billed Gull
All birds seen in Maine in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 449 | Aug (past peak) |
| 2 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 243 | Aug (past peak) |
| 3 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 235 | Aug (past peak) |
| 4 | Common Loon | Gavia immer | Loons | 223 | Jul (past peak) |
| 5 | Common Eider | Somateria mollissima | Ducks, Geese, and Swans | 218 | Jun (past peak) |
| 6 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 216 | May (past peak) |
| 7 | Song Sparrow | Melospiza melodia | New World Sparrows | 215 | Jun (past peak) |
| 8 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 215 | Oct (peak) |
| 9 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 208 | Aug (past peak) |
| 10 | White-throated Sparrow | Zonotrichia albicollis | New World Sparrows | 192 | Oct (peak) |
| 11 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 168 | Aug (past peak) |
| 12 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 167 | Aug (past peak) |
| 13 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 153 | Jul (past peak) |
| 14 | Semipalmated Plover | Charadrius semipalmatus | Plovers and Lapwings | 152 | Aug (past peak) |
| 15 | Great Black-backed Gull | Larus marinus | Gulls, Terns, and Skimmers | 147 | Aug (past peak) |
| 16 | Hermit Thrush | Catharus guttatus | Thrushes | 129 | Jul (past peak) |
| 17 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 121 | Jul (past peak) |
| 18 | Hairy Woodpecker | Leuconotopicus villosus | Woodpeckers | 119 | May (past peak) |
| 19 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 109 | Jul (past peak) |
| 20 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 102 | May (past peak) |
| 21 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 99 | Aug (past peak) |
| 22 | Greater Yellowlegs | Tringa melanoleuca | Sandpipers and Allies | 93 | Aug (past peak) |
| 23 | Ruby-crowned Kinglet | Corthylio calendula | Kinglets | 90 | Apr (past peak) |
| 24 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 89 | Jul (past peak) |
| 25 | Red-breasted Nuthatch | Sitta canadensis | Nuthatches | 85 | Aug (past peak) |
| 26 | Savannah Sparrow | Passerculus sandwichensis | New World Sparrows | 84 | May (past peak) |
| 27 | Golden-crowned Kinglet | Regulus satrapa | Kinglets | 84 | Oct (peak) |
| 28 | Ruffed Grouse | Bonasa umbellus | Pheasants, Grouse, and Allies | 81 | Jun (past peak) |
| 29 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 79 | May (past peak) |
| 30 | Black Guillemot | Cepphus grylle | Auks, Murres, and Puffins | 76 | Jul (past peak) |
| 31 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 76 | Mar (past peak) |
| 32 | Pileated Woodpecker | Dryocopus pileatus | Woodpeckers | 75 | May (past peak) |
| 33 | American Robin | Turdus migratorius | Thrushes | 71 | May (past peak) |
| 34 | Eastern Bluebird | Sialia sialis | Thrushes | 68 | Mar (past peak) |
| 35 | Swamp Sparrow | Melospiza georgiana | New World Sparrows | 67 | Oct (peak) |
| 36 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 67 | Aug (past peak) |
| 37 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 66 | Apr (past peak) |
| 38 | Yellow-bellied Sapsucker | Sphyrapicus varius | Woodpeckers | 65 | May (past peak) |
| 39 | Barred Owl | Strix varia | Typical Owls | 60 | Jul (past peak) |
| 40 | Palm Warbler | Setophaga palmarum | New World Warblers | 60 | Apr (past peak) |
| 41 | House Sparrow | Passer domesticus | Old World Sparrows | 57 | Jun (past peak) |
| 42 | Black-bellied Plover | Pluvialis squatarola | Plovers and Lapwings | 55 | Aug (past peak) |
| 43 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 55 | Aug (past peak) |
| 44 | Hooded Merganser | Lophodytes cucullatus | Ducks, Geese, and Swans | 54 | Mar (past peak) |
| 45 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 54 | May (past peak) |
| 46 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 54 | Aug (past peak) |
| 47 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 53 | May (past peak) |
| 48 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 52 | Sep (past peak) |
| 49 | Dunlin | Calidris alpina | Sandpipers and Allies | 52 | Oct (peak) |
| 50 | Canada Jay | Perisoreus canadensis | Crows, Jays, and Magpies | 52 | Oct (peak) |