| Checklist of the Birds of Delaware County - 330 Species | |||||||||
| Seasonal Status | Abundance Codes | ||||||||
| SP - March thru May | C - Common: certain to be seen in suitable habitat in proper season | ||||||||
| U - Uncommon: present, but not certain to be seen | |||||||||
| S - June thru July | O - Occasional: seen annually, but only a few times during a season | ||||||||
| R - Rare: not seen annually | |||||||||
| F - August thru November | X - Accidental; less than three records | ||||||||
| W - December thru February | |||||||||
| Species | SP | S | F | W | Species | SP | S | F | W |
| Greater White-fronted Goose | X | Common Loon | U | X | U | R | |||
| Snow Goose | O | R | O | O | Pied-billed Grebe | U | R | U | U |
| Ross's Goose | X | Horned Grebe | O | O | O | ||||
| Brant | R | R | Red-necked Grebe | R | R | R | |||
| Cackling Goose | R | R | R | Eared Grebe | X | ||||
| Canada Goose | C | C | C | C | Leach's Storm-Petrel | X | |||
| Mute Swan | R | R | R | R | Northern Gannet | X | X | ||
| Tundra Swan | O | O | O | Double-crested Cormorant | C | U | C | O | |
| Wood Duck | C | C | C | R | Great Cormorant | R | R | ||
| Gadwall | U | U | R | Anhinga | X | ||||
| Eurasian Wigeon | X | American Bittern | R | R | R | R | |||
| American Wigeon | U | U | O | Least Bittern | O | O | O | ||
| American Black Duck | U | U | U | U | Great Blue Heron | C | C | C | U |
| Mallard | C | C | C | C | Great Egret | C | C | C | R |
| Blue-winged Teal | U | R | U | R | Snowy Egret | U | U | U | |
| Northern Shoveler | C | R | C | U | Little Blue Heron | R | U | U | |
| Northern Pintail | C | R | C | U | Tricolored Heron | X | R | R | |
| Green-winged Teal | C | R | C | U | Cattle Egret | R | R | R | |
| Canvasback | R | R | R | Green Heron | C | C | C | R | |
| Redhead | R | R | R | Black-crowned Night-Heron | U | U | U | O | |
| Ring-necked Duck | U | U | O | Yellow-crowned Night-Heron | R | R | R | ||
| Greater Scaup | O | O | O | White Ibis | R | R | |||
| Lesser Scaup | R | R | R | Glossy Ibis | R | R | R | ||
| Surf Scoter | X | X | X | Black Vulture | U | U | U | U | |
| White-winged Scoter | Â | R | X | Turkey Vulture | C | C | C | C | |
| Black Scoter | Â | R | X | Osprey | U | R | U | X | |
| Long-tailed Duck | R | R | R | Swallow-tailed Kite | X | ||||
| Bufflehead | U | X | U | U | Golden Eagle | X | R | R | |
| Common Goldeneye | O | O | O | Mississippi Kite | X | ||||
| Hooded Merganser | U | U | U | Northern Harrier | U | R | U | O | |
| Common Merganser | C | U | C | Sharp-shinned Hawk | U | R | C | U | |
| Red-breasted Merganser | R | R | Cooper's Hawk | U | O | U | U | ||
| Ruddy Duck | U | R | U | U | Northern Goshawk | R | R | O | R |
| Ring-necked Pheasant | O | O | O | O | Bald Eagle | U | U | U | U |
| Wild Turkey | O | O | O | Red-shouldered Hawk | U | R | U | R | |
| Northern Bobwhite | O | O | O | R | Broad-winged Hawk | C | U | C | X |
| Red-throated Loon | R | R | R | Swainson's Hawk | X | ||||
| Species | SP | S | F | W | Species | SP | S | F | W |
| Red-tailed Hawk | C | U | C | C | Red Phalarope | X | |||
| Rough-legged Hawk | R | R | R | Black-legged Kittiwake | X | ||||
| Yellow Rail | X | X | Sabine's Gull | X | |||||
| Black Rail | X | R | Bonaparte's Gull | O | O | ||||
| King Rail | R | R | R | X | Little Gull | X | |||
| Virginia Rail | O | O | O | R | Laughing Gull | C | U | C | R |
| Sora | R | R | R | R | Ring-billed Gull | C | C | C | C |
| Common Gallinule | O | O | O | R | Herring Gull | U | U | U | U |
| American Coot | U | U | U | Iceland Gull | R | R | R | ||
| Sandhill Crane | X | X | Lesser Black-backed Gull | R | R | ||||
| Black-bellied Plover | R | O | X | Glaucous Gull | R | R | R | ||
| American Golden-Plover | X | R | Great Black-backed Gull | U | U | U | U | ||
| Wilson's Plover | X | Sooty Tern | X | ||||||
| Semipalmated Plover | U | O | U | Least Tern | R | ||||
| Piping Plover | X | Gull-billed Tern | X | ||||||
| Killdeer | U | U | U | U | Caspian Tern | O | O | U | |
| American Oystercatcher | X | Black Tern | R | R | R | ||||
| Black-necked Stilt | X | X | Common Tern | R | R | ||||
| American Avocet | X | X | Arctic Tern | X | |||||
| Spotted Sandpiper | U | U | U | Forster's Tern | U | U | C | ||
| Solitary Sandpiper | U | O | U | Royal Tern | X | ||||
| Greater Yellowlegs | U | R | U | R | Black Skimmer | X | |||
| Willet | X | X | Pomarine Jaeger | X | |||||
| Lesser Yellowlegs | U | R | U | R | Parasitic Jaeger | X | |||
| Upland Sandpiper | R | R | R | Dovekie | X | ||||
| Whimbrel | X | X | Rock Pigeon | C | C | C | C | ||
| Black-tailed Godwit | X | Mourning Dove | C | C | C | C | |||
| Hudsonian Godwit | R | R | Yellow-billed Cuckoo | O | O | O | |||
| Marbled Godwit | R | Black-billed Cuckoo | O | O | O | ||||
| Ruddy Turnstone | R | X | Barn Owl | R | R | R | R | ||
| Red Knot | R | X | Eastern Screech-Owl | U | U | U | U | ||
| Sanderling | R | Great Horned Owl | U | U | U | U | |||
| Semipalmated Sandpiper | U | O | C | Snowy Owl | R | R | |||
| Western Sandpiper | O | O | Barred Owl | R | R | R | R | ||
| Least Sandpiper | U | O | C | X | Long-eared Owl | R | R | R | |
| White-rumped Sandpiper | O | O | Short-eared Owl | R | R | R | R | ||
| Baird's Sandpiper | O | O | Northern Saw-whet Owl | R | R | R | |||
| Pectoral Sandpiper | U | O | U | X | Common Nighthawk | O | O | U | |
| Dunlin | O | O | R | Eastern Whip-poor-will | R | R | R | ||
| Curlew Sandpiper | X | X | Chimney Swift | C | C | C | |||
| Stilt Sandpiper | O | Ruby-throated Hummingbird | U | C | U | ||||
| Buff-breasted Sandpiper | R | Rufous Hummingbird | X | X | |||||
| Ruff | R | R | X | Belted Kingfisher | U | U | U | O | |
| Short-billed Dowitcher | O | O | Red-headed Woodpecker | R | R | R | |||
| Long-billed Dowitcher | R | R | Red-bellied Woodpecker | C | C | C | C | ||
| Wilson's Snipe | U | U | U | Yellow-bellied Sapsucker | O | O | O | ||
| American Woodcock | O | O | O | R | Downy Woodpecker | C | C | C | C |
| Wilson's Phalarope | R | R | Hairy Woodpecker | U | U | U | U | ||
| Red-necked Phalarope | X | R | Black-backed Woodpecker | X | X | ||||
| Species | SP | S | F | W | Species | SP | S | F | W |
| Northern Flicker | C | C | C | C | Carolina Wren | C | C | C | C |
| Pileated Woodpecker | O | O | O | O | Blue-gray Gnatcatcher | C | C | C | R |
| American Kestrel | U | U | C | U | Golden-crowned Kinglet | U | U | O | |
| Merlin | R | O | R | Ruby-crowned Kinglet | C | C | O | ||
| Peregrine Falcon | R | R | O | R | Eastern Bluebird | U | U | U | U |
| Olive-sided Flycatcher | O | R | O | Veery | C | C | C | ||
| Eastern Wood-Pewee | C | C | C | Gray-cheeked Thrush | O | O | |||
| Yellow-bellied Flycatcher | O | O | Swainson's Thrush | U | U | ||||
| Acadian Flycatcher | C | C | C | Hermit Thrush | U | O | |||
| Alder Flycatcher | R | R | Wood Thrush | U | U | U | X | ||
| Willow Flycatcher | U | C | U | American Robin | C | C | C | C | |
| Least Flycatcher | O | X | O | Varied Thrush | X | ||||
| Eastern Phoebe | U | U | U | Gray Catbird | C | C | C | R | |
| Say's Phoebe | X | Northern Mockingbird | C | C | C | C | |||
| Great Crested Flycatcher | U | U | U | Brown Thrasher | O | O | O | R | |
| Western Kingbird | R | European Starling | C | C | C | C | |||
| Eastern Kingbird | C | C | C | American Pipit | O | O | R | ||
| Scissor-tailed Flycatcher | X | Cedar Waxwing | U | U | U | U | |||
| Loggerhead Shrike | R | R | R | Lapland Longspur | R | R | R | ||
| Northern Shrike | X | X | X | Snow Bunting | O | O | O | ||
| White-eyed Vireo | C | C | C | Ovenbird | C | C | C | R | |
| Yellow-throated Vireo | O | O | O | Worm-eating Warbler | O | R | O | ||
| Blue-headed Vireo | O | O | Louisiana Waterthrush | O | O | O | |||
| Warbling Vireo | U | U | U | Northern Waterthrush | O | O | |||
| Philadelphia Vireo | X | O | Blue-winged Warbler | U | U | U | |||
| Red-eyed Vireo | C | C | C | Golden-winged Warbler | R | R | |||
| Blue Jay | C | C | C | C | Black-and-white Warbler | U | R | U | X |
| American Crow | C | C | C | C | Prothonotary Warbler | R | R | ||
| Fish Crow | O | O | O | O | Swainson's Warbler | X | |||
| Common Raven | U | U | U | U | Tennessee Warbler | O | O | ||
| Horned Lark | R | R | R | R | Orange-crowned Warbler | R | R | R | |
| Northern Rough-winged Swallow | U | U | U | Nashville Warbler | O | O | X | ||
| Purple Martin | U | U | U | Connecticut Warbler | X | R | |||
| Tree Swallow | C | C | C | Mourning Warbler | R | R | |||
| Bank Swallow | U | R | U | Kentucky Warbler | O | O | O | ||
| Barn Swallow | C | C | C | Common Yellowthroat | C | C | C | R | |
| Cliff Swallow | O | O | O | Hooded Warbler | O | O | O | ||
| Cave Swallow | X | American Redstart | C | U | C | ||||
| Carolina Chickadee | C | C | C | C | Cape May Warbler | O | O | X | |
| Black-capped Chickadee | R | R | O | Cerulean Warbler | R | R | R | ||
| Boreal Chickadee | X | X | X | Northern Parula | U | U | U | ||
| Tufted Titmouse | C | C | C | C | Magnolia Warbler | U | U | ||
| Red-breasted Nuthatch | U | R | U | U | Bay-breasted Warbler | O | O | ||
| White-breasted Nuthatch | U | U | U | U | Blackburnian Warbler | O | O | ||
| Brown Creeper | O | X | O | O | Yellow Warbler | C | C | C | X |
| House Wren | C | C | C | R | Chestnut-sided Warbler | U | U | U | |
| Winter Wren | O | O | O | Blackpoll Warbler | U | R | U | ||
| Sedge Wren | R | Black-throated Blue Warbler | U | U | |||||
| Marsh Wren | U | U | U | R | Pine Warbler | O | R | O | R |
| Species | SP | S | F | W | Species | SP | S | F | W |
| Palm Warbler | U | U | R | Rusty Blackbird | O | O | O | ||
| Yellow-rumped Warbler | C | C | O | Brewer's Blackbird | X | X | |||
| Yellow-throated Warbler | O | R | R | Common Grackle | C | C | C | U | |
| Prairie Warbler | U | U | U | Brown-headed Cowbird | C | C | C | U | |
| Black-throated Gray Warbler | X | Orchard Oriole | O | O | O | ||||
| Townsend's Warbler | X | Baltimore Oriole | C | C | C | R | |||
| Black-throated Green Warbler | U | U | X | Pine Grosbeak | X | X | |||
| Canada Warbler | O | R | O | Purple Finch | O | O | O | ||
| Wilson's Warbler | O | O | R | House Finch | C | C | C | C | |
| Yellow-breasted Chat | O | O | O | R | Red Crossbill | R | R | R | |
| Eastern Towhee | U | U | U | O | White-winged Crossbill | R | R | R | |
| American Tree Sparrow | O | O | O | Common Redpoll | R | R | R | ||
| Chipping Sparrow | C | C | C | R | Pine Siskin | R | R | R | |
| Clay-colored Sparrow | R | R | X | American Goldfinch | C | C | C | C | |
| Field Sparrow | U | U | U | O | Evening Grosbeak | R | R | R | |
| Vesper Sparrow | R | O | R | House Sparrow | C | C | C | C | |
| Lark Sparrow | X | X | |||||||
| Savannah Sparrow | O | O | R | ||||||
| Grasshopper Sparrow | R | R | Total Species 330 | ||||||
| LeConte's Sparrow | X | X | |||||||
| Nelson's Sharp-tailed Sparrow | X | X | |||||||
| Seaside Sparrow | X | ||||||||
| Fox Sparrow | O | O | O | Additional Species | |||||
| Song Sparrow | C | C | C | C | Hypothetical: may have occurred | ||||
| Lincoln's Sparrow | O | O | X | King Eider | |||||
| Swamp Sparrow | U | U | U | O | Ruffed Grouse | ||||
| White-throated Sparrow | C | R | C | C | Audubon's Shearwater | ||||
| White-crowned Sparrow | O | O | R | Clapper Rail | |||||
| Golden-crowned Sparrow | X | Black Guillemot | |||||||
| Dark-eyed Junco | C | C | C | Atlantic Puffin | |||||
| Summer Tanager | R | X | Bewick's Wren | ||||||
| Scarlet Tanager | U | U | U | ||||||
| Western Tanager | X | ||||||||
| Northern Cardinal | C | C | C | C | |||||
| Rose-breasted Grosbeak | U | R | U | Extirpated: formerly occurred | |||||
| Black-headed Grosbeak | X | Whooping Crane | |||||||
| Blue Grosbeak | O | O | O | Red-cockaded Woodpecker | |||||
| Indigo Bunting | C | C | C | X | |||||
| Painted Bunting | X | X | |||||||
| Dickcissel | R | R | R | Extinct | |||||
| Bobolink | O | O | U | X | Passenger Pigeon | ||||
| Red-winged Blackbird | C | C | C | U | |||||
| Eastern Meadowlark | O | R | O | R | |||||
| Yellow-headed Blackbird | R | R | |||||||