60 birds were recorded seen in Connecticut in December in our iNaturalist sample; 4 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in December

Dark-eyed Junco

Northern Cardinal

White-throated Sparrow

Tufted Titmouse
Downy Woodpecker

Blue Jay

Black-capped Chickadee

American Herring Gull

Red-tailed Hawk

Carolina Wren
Red-bellied Woodpecker

Song Sparrow
All birds seen in Connecticut in December
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 317 | Dec (peak) |
| 2 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 250 | Apr (past peak) |
| 3 | White-throated Sparrow | Zonotrichia albicollis | New World Sparrows | 237 | Oct (past peak) |
| 4 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 233 | Jan (past peak) |
| 5 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 224 | Jan (past peak) |
| 6 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 221 | Apr (past peak) |
| 7 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 196 | Jan (past peak) |
| 8 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 158 | Aug (past peak) |
| 9 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 151 | Mar (past peak) |
| 10 | Carolina Wren | Thryothorus ludovicianus | Wrens | 147 | Jan (past peak) |
| 11 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 146 | Jan (past peak) |
| 12 | Song Sparrow | Melospiza melodia | New World Sparrows | 145 | Oct (past peak) |
| 13 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 137 | Feb (past peak) |
| 14 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 137 | Oct (past peak) |
| 15 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 135 | May (past peak) |
| 16 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 127 | Apr (past peak) |
| 17 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 124 | Jan (past peak) |
| 18 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 124 | Oct (past peak) |
| 19 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 121 | Aug (past peak) |
| 20 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 113 | Apr (past peak) |
| 21 | Hooded Merganser | Lophodytes cucullatus | Ducks, Geese, and Swans | 110 | Jan (past peak) |
| 22 | House Sparrow | Passer domesticus | Old World Sparrows | 104 | Feb (past peak) |
| 23 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 98 | Apr (past peak) |
| 24 | American Black Duck | Anas rubripes | Ducks, Geese, and Swans | 88 | Dec (peak) |
| 25 | Eastern Bluebird | Sialia sialis | Thrushes | 85 | Apr (past peak) |
| 26 | Bufflehead | Bucephala albeola | Ducks, Geese, and Swans | 83 | Jan (past peak) |
| 27 | Common Loon | Gavia immer | Loons | 80 | Apr (past peak) |
| 28 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 77 | Apr (past peak) |
| 29 | Red-breasted Merganser | Mergus serrator | Ducks, Geese, and Swans | 74 | Feb (past peak) |
| 30 | European Starling | Sturnus vulgaris | Starlings | 73 | Apr (past peak) |
| 31 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 72 | Apr (past peak) |
| 32 | Yellow-bellied Sapsucker | Sphyrapicus varius | Woodpeckers | 70 | Oct (past peak) |
| 33 | Mute Swan | Cygnus olor | Ducks, Geese, and Swans | 67 | Apr (past peak) |
| 34 | Barred Owl | Strix varia | Typical Owls | 63 | Jun (past peak) |
| 35 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 61 | Apr (past peak) |
| 36 | American Robin | Turdus migratorius | Thrushes | 60 | Apr (past peak) |
| 37 | Brant | Branta bernicla | Ducks, Geese, and Swans | 59 | Apr (past peak) |
| 38 | Long-tailed Duck | Clangula hyemalis | Ducks, Geese, and Swans | 59 | Jan (past peak) |
| 39 | Pileated Woodpecker | Dryocopus pileatus | Woodpeckers | 59 | Apr (past peak) |
| 40 | Northern Flicker | Colaptes auratus | Woodpeckers | 57 | Apr (past peak) |
| 41 | Horned Lark | Eremophila alpestris | Larks | 49 | Jan (past peak) |
| 42 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 46 | Aug (past peak) |
| 43 | Common Goldeneye | Bucephala clangula | Ducks, Geese, and Swans | 43 | Feb (past peak) |
| 44 | American Tree Sparrow | Spizelloides arborea | New World Sparrows | 42 | Dec (peak) |
| 45 | Dunlin | Calidris alpina | Sandpipers and Allies | 41 | Dec (peak) |
| 46 | Gadwall | Mareca strepera | Ducks, Geese, and Swans | 41 | Feb (past peak) |
| 47 | Common Eider | Somateria mollissima | Ducks, Geese, and Swans | 39 | Jan (past peak) |
| 48 | Northern Harrier | Circus hudsonius | Hawks, Eagles, and Kites | 36 | Oct (past peak) |
| 49 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 35 | Sep (past peak) |
| 50 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 35 | Jan (past peak) |