60 birds were recorded seen in Massachusetts in December 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 December

Black-capped Chickadee

Northern Cardinal

Mallard
Downy Woodpecker

Red-tailed Hawk
Canada Goose

Tufted Titmouse

Dark-eyed Junco

Common Eider

Hooded Merganser

Blue Jay

Song Sparrow
All birds seen in Massachusetts in December
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 1,020 | Apr (past peak) |
| 2 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 729 | Apr (past peak) |
| 3 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 689 | Apr (past peak) |
| 4 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 628 | Apr (past peak) |
| 5 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 618 | Apr (past peak) |
| 6 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 613 | Apr (past peak) |
| 7 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 587 | Apr (past peak) |
| 8 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 574 | Jan (past peak) |
| 9 | Common Eider | Somateria mollissima | Ducks, Geese, and Swans | 553 | Jan (past peak) |
| 10 | Hooded Merganser | Lophodytes cucullatus | Ducks, Geese, and Swans | 552 | Jan (past peak) |
| 11 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 525 | Apr (past peak) |
| 12 | Song Sparrow | Melospiza melodia | New World Sparrows | 488 | Apr (past peak) |
| 13 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 481 | Aug (past peak) |
| 14 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 433 | Apr (past peak) |
| 15 | White-throated Sparrow | Zonotrichia albicollis | New World Sparrows | 432 | Apr (past peak) |
| 16 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 427 | Dec (peak) |
| 17 | American Robin | Turdus migratorius | Thrushes | 421 | Apr (past peak) |
| 18 | Bufflehead | Bucephala albeola | Ducks, Geese, and Swans | 419 | Mar (past peak) |
| 19 | House Sparrow | Passer domesticus | Old World Sparrows | 418 | Apr (past peak) |
| 20 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 415 | Apr (past peak) |
| 21 | Mute Swan | Cygnus olor | Ducks, Geese, and Swans | 377 | Apr (past peak) |
| 22 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 359 | Aug (past peak) |
| 23 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 340 | Apr (past peak) |
| 24 | Red-breasted Merganser | Mergus serrator | Ducks, Geese, and Swans | 329 | Feb (past peak) |
| 25 | Long-tailed Duck | Clangula hyemalis | Ducks, Geese, and Swans | 328 | Jan (past peak) |
| 26 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 316 | Apr (past peak) |
| 27 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 295 | Apr (past peak) |
| 28 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 293 | Apr (past peak) |
| 29 | American Black Duck | Anas rubripes | Ducks, Geese, and Swans | 292 | Jan (past peak) |
| 30 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 282 | Aug (past peak) |
| 31 | Carolina Wren | Thryothorus ludovicianus | Wrens | 276 | Apr (past peak) |
| 32 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 273 | May (past peak) |
| 33 | Great Black-backed Gull | Larus marinus | Gulls, Terns, and Skimmers | 262 | Aug (past peak) |
| 34 | Common Loon | Gavia immer | Loons | 262 | Apr (past peak) |
| 35 | Eastern Bluebird | Sialia sialis | Thrushes | 257 | Apr (past peak) |
| 36 | American Tree Sparrow | Spizelloides arborea | New World Sparrows | 250 | Dec (peak) |
| 37 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 234 | Apr (past peak) |
| 38 | White-winged Scoter | Melanitta deglandi | Ducks, Geese, and Swans | 224 | Nov (past peak) |
| 39 | European Starling | Sturnus vulgaris | Starlings | 213 | Apr (past peak) |
| 40 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 211 | Mar (past peak) |
| 41 | Surf Scoter | Melanitta perspicillata | Ducks, Geese, and Swans | 201 | Jan (past peak) |
| 42 | Barred Owl | Strix varia | Typical Owls | 192 | May (past peak) |
| 43 | Black Scoter | Melanitta americana | Ducks, Geese, and Swans | 192 | Dec (peak) |
| 44 | Common Goldeneye | Bucephala clangula | Ducks, Geese, and Swans | 187 | Jan (past peak) |
| 45 | Harlequin Duck | Histrionicus histrionicus | Ducks, Geese, and Swans | 163 | Nov (past peak) |
| 46 | Northern Harrier | Circus hudsonius | Hawks, Eagles, and Kites | 159 | Jan (past peak) |
| 47 | Pileated Woodpecker | Dryocopus pileatus | Woodpeckers | 157 | Apr (past peak) |
| 48 | Ring-necked Duck | Aythya collaris | Ducks, Geese, and Swans | 154 | Mar (past peak) |
| 49 | Golden-crowned Kinglet | Regulus satrapa | Kinglets | 152 | Oct (past peak) |
| 50 | Sanderling | Calidris alba | Sandpipers and Allies | 139 | Aug (past peak) |