Located in the foothills of the San Gabriel Mountains, Eaton Canyon Park attracts a diversity of birds through the seasons. Natural communities in the canyon include oak woodland, coastal sage scrub, open wash with riparian vegetation along the intermittent stream and the adjacent chaparral-covered hillsides. A walk through the canyon during the peak of the spring migration (April-May) should provide an abundance of warblers, vireos, orioles, and flycatchers, along with the wide variety of resident birds. Hawks and owls hunt the chaparral and oak woodlands by day and night, respectively.
The list below, which is arranged in phylogenetic order (reading down each column) by common name, contains over 150 species and subspecies known to have been seen at one time or another in the Park. New birds are being added yearly. Refer to the chart for explanations of the abbreviations, and click on the underlined names to view photos.
| C = Common | FC = Fairly Common | U = Uncommon | O = Occasional | R = Rare |
| Vag = Vagrant | Res = Resident | WV = Winter Visitor | SV = Summer Visitor | M = Migrant |
| American White Pelican (flying) R:M | Bewick's Wren C:Res |
| Great Blue Heron R:WV | House Wren C:SV |
| Green Heron R:WV | American Dipper R:Res |
| White-faced Ibis (flying) R:M | Ruby-crowned Kinglet C:WV |
| Mallard R:WV | Blue-gray Gnatcatcher O:WV |
| Turkey Vulture O:M | Western Bluebird U:Res |
| Osprey (flying) R:M | Townsend's Solitaire R:WV |
| Northern Harrier R:M | Swainson's Thrush C:M |
| Sharp-shinned Hawk FC:WV | Hermit Thrush C:WV |
| Cooper's Hawk U:Res | American Robin O:WV |
| Red-shouldered Hawk O:Res | Varied Thrush R:WV |
| Swainson's Hawk R:M | Wrentit C:Res |
| Red-tailed Hawk C:Res | Northern Mockingbird C:Res |
| Ferruginous Hawk R:M | Sage Thrasher Vag |
| Golden Eagle R:WV | Brown Thrasher Vag |
| American Kestral O:Res | California Thrasher C:Res |
| California Quail C:Res | Cedar Waxwing O:WV |
| Killdeer O:SV | Phainopepla FC:SV |
| Common Snipe R:WV | Northern Shrike Vag |
| Rock Dove U:Res | Loggerhead Shrike O:Res |
| Band-tailed Pigeon C:WV | European Starling C:Res |
| Spotted Dove O:Res | Cassin's Vireo O:M |
| Mourning Dove C:Res | Hutton's Vireo O:M |
| Common Ground-dove R:M | Warbling Vireo C:M |
| Greater Roadrunner U:Res | Tennessee Warbler Vag |
| Barn Owl R:M | Orange-crowned Warbler C:M |
| Western Screech-owl U:Res | Nashville Warbler C:M |
| Great Horned Owl C:Res | Virginia's Warbler U:M |
| Northern Pygmy-owl R:Res | Yellow Warbler U:M |
| Northern Saw-whet Owl R:WV | Chestnut-sided Warbler Vag |
| Lesser Nighthawk R:SV | Black-throated Blue Warbler Vag |
| Common Poorwill U:Res | Yellow-rumped (Aud.) Warbler C:WV |
| Vaux's Swift O:M | Yellow-rumped (Myrtle) Wrbler R:WV |
| White-throated Swift C:Res | Black-throated Gray Warbler C:M |
| Black-chinned Hummingbird U:SV | Townsend's Warbler FC:M |
| Anna's Hummingbird C:Res | Hermit Warbler U:M |
| Costa's Hummingbird U:M | Prothonotary Warbler Vag |
| Rufous Hummingbird U:M | MacGillivray's Warbler O:M |
| Allen's Hummingbird U:M | Common Yellowthroat U:M |
| Belted Kingfisher O:M | Hooded Warbler Vag |
| Lewis' Woodpecker R:WV | Wilson's Warbler C:M |
| Acorn Woodpecker C:Res | Yellow-breasted Chat R:M |
| Red-naped Sapsucker O:WV | Summer Tanager Vag |
| Red-breasted Sapsucker U:WV | Western Tanager U:SV |
| Nuttal's Woodpecker C:Res | Black-headed Grosbeak C:SV |
| Downey Woodpecker C:Res | Lazuli Bunting R:M |
| Hairy Woodpecker U:Res | Green-tailed Towhee R:M |
| Northern (Yellow-shafted) Flicker Vag | Spotted Towhee C:Res |
| Norther (Red-shafted) Flicker C:Res | California Towhee C:Res |
| Olive-sided Flycatcher U:M | Rufous-crowned Sparrow U:Res |
| Western Wood-pewee C:M | Chipping Sparrow O:M |
| Willow Flycatcher R:M | Brewer's Sparrow Vag |
| Hammond's Flycatcher U:M | Lark Sparrow R:WV |
| Dusky Flycatcher R:M | Black-throated Sparrow R:M |
| Gray Flycatcher Vag | Sage Sparrow R:M |
| Pacific-slope Flycatcher C:M | Savannah Sparrow U:WV |
| Black Phoebe FC:Res | Fox Sparrow U:WV |
| Say's Phoebe O:WV | Song Sparrow U:Res |
| Ash-throated Flycatcher FC:SV | Lincoln's Sparrow U:WV |
| Cassin's Kingbird R:M | Swamp Sparrow Vag |
| Western Kingbird O:M | White-throated Sparrow Vag |
| Tree Swallow U:M | Golden-crowned Sparrow C:WV |
| Violet-green Swallow C:M | White-crowned Sparrow C:WV |
| Northern Rough-winged Swallow U:M | Harris' Sparrow Vag |
| Cliff Swallow U:M | Dark-eyed (Oregon) Junco C:WV |
| Barn Swallow O:M | Dark-eyed (Sl.-colored) Junco R:WV |
| Steller's Jay O:WV | Dark-eyed (Gr.-headed) Junco R:WV |
| Western Scrub Jay C:Res | Western Meadowlark R:M |
| American Crow C:Res | Brown-headed Cowbird O:SV |
| Common Raven FC:Res | Hooded Oriole C:SV |
| Mountain Chickadee O:WV | Bullock's Oriole C:SV |
| Oak Titmouse C:Res | Purple Finch U:WV |
| Bushtit C:Res | House Finch C:Res |
| Red-breasted Nuthatch O:WV | Pine Siskin O:WV |
| White-breasted Nuthatch O:WV | Lesser Goldfinch FC:SV |
| Brown Creeper R:WV | Lawrence's Goldfinch O:WV |
| Rock Wren FC:Res | American Goldfinch C:WV |
| Canyon Wren U:Res | House Sparrow C:Res |