60 birds were recorded seen in California in December in our iNaturalist sample; 1 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in December

Red-tailed Hawk

White-crowned Sparrow

Yellow-rumped Warbler
Black Phoebe
American Coot

Great Egret

Great Blue Heron
Snowy Egret

Western Gull

Mallard
Anna's Hummingbird
House Finch
All birds seen in California in December
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 10,114 | Jan (past peak) |
| 2 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 8,852 | Jan (past peak) |
| 3 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 6,762 | Jan (past peak) |
| 4 | Black Phoebe | Sayornis nigricans | Tyrant Flycatchers | 6,716 | Apr (past peak) |
| 5 | American Coot | Fulica americana | Rails, Gallinules, and Coots | 6,138 | Jan (past peak) |
| 6 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 5,775 | Jan (past peak) |
| 7 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 5,758 | Jan (past peak) |
| 8 | Snowy Egret | Egretta thula | Herons, Egrets, and Bitterns | 5,497 | Jan (past peak) |
| 9 | Western Gull | Larus occidentalis | Gulls, Terns, and Skimmers | 5,277 | Aug (past peak) |
| 10 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 5,098 | Apr (past peak) |
| 11 | Anna's Hummingbird | Calypte anna | Hummingbirds | 4,981 | Apr (past peak) |
| 12 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 4,703 | Apr (past peak) |
| 13 | California Scrub-Jay | Aphelocoma californica | Crows, Jays, and Magpies | 4,322 | Apr (past peak) |
| 14 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 4,291 | Jan (past peak) |
| 15 | Bufflehead | Bucephala albeola | Ducks, Geese, and Swans | 4,243 | Jan (past peak) |
| 16 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 3,952 | Jan (past peak) |
| 17 | American Wigeon | Mareca americana | Ducks, Geese, and Swans | 3,910 | Jan (past peak) |
| 18 | Turkey Vulture | Cathartes aura | New World Vultures | 3,869 | Apr (past peak) |
| 19 | California Towhee | Melozone crissalis | New World Sparrows | 3,682 | Apr (past peak) |
| 20 | Ruby-crowned Kinglet | Corthylio calendula | Kinglets | 3,680 | Dec (peak) |
| 21 | Golden-crowned Sparrow | Zonotrichia atricapilla | New World Sparrows | 3,664 | Jan (past peak) |
| 22 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 3,603 | Apr (past peak) |
| 23 | Say's Phoebe | Sayornis saya | Tyrant Flycatchers | 3,541 | Jan (past peak) |
| 24 | American Kestrel | Falco sparverius | Falcons and Caracaras | 3,478 | Jan (past peak) |
| 25 | Northern Shoveler | Spatula clypeata | Ducks, Geese, and Swans | 3,447 | Jan (past peak) |
| 26 | Western Bluebird | Sialia mexicana | Thrushes | 3,238 | Apr (past peak) |
| 27 | Black-crowned Night Heron | Nycticorax nycticorax | Herons, Egrets, and Bitterns | 3,135 | Apr (past peak) |
| 28 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 3,116 | Jan (past peak) |
| 29 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 3,087 | Jul (past peak) |
| 30 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 3,039 | Apr (past peak) |
| 31 | Common Raven | Corvus corax | Crows, Jays, and Magpies | 3,036 | Apr (past peak) |
| 32 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 3,012 | Apr (past peak) |
| 33 | Acorn Woodpecker | Melanerpes formicivorus | Woodpeckers | 2,987 | Apr (past peak) |
| 34 | Brown Pelican | Pelecanus occidentalis | Pelicans | 2,955 | Sep (past peak) |
| 35 | Lesser Goldfinch | Spinus psaltria | Finches, Euphonias, and Allies | 2,940 | Apr (past peak) |
| 36 | Song Sparrow | Melospiza melodia | New World Sparrows | 2,819 | Apr (past peak) |
| 37 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 2,801 | Apr (past peak) |
| 38 | Willet | Tringa semipalmata | Sandpipers and Allies | 2,697 | Jan (past peak) |
| 39 | Pied-billed Grebe | Podilymbus podiceps | Grebes | 2,679 | Jan (past peak) |
| 40 | Ruddy Duck | Oxyura jamaicensis | Ducks, Geese, and Swans | 2,585 | Jan (past peak) |
| 41 | Townsend's Warbler | Setophaga townsendi | New World Warblers | 2,307 | Oct (past peak) |
| 42 | Common Goldeneye | Bucephala clangula | Ducks, Geese, and Swans | 2,295 | Jan (past peak) |
| 43 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 2,235 | Apr (past peak) |
| 44 | Northern Pintail | Anas acuta | Ducks, Geese, and Swans | 2,219 | Jan (past peak) |
| 45 | Northern Harrier | Circus hudsonius | Hawks, Eagles, and Kites | 2,201 | Jan (past peak) |
| 46 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 2,163 | Jan (past peak) |
| 47 | Savannah Sparrow | Passerculus sandwichensis | New World Sparrows | 2,141 | Oct (past peak) |
| 48 | Least Sandpiper | Calidris minutilla | Sandpipers and Allies | 2,131 | Sep (past peak) |
| 49 | American Robin | Turdus migratorius | Thrushes | 2,078 | Apr (past peak) |
| 50 | Northern Flicker | Colaptes auratus | Woodpeckers | 2,052 | Oct (past peak) |