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| Type | Common Name | [Latin Name] |
| Gadwall | - Gadwall | [Anas strepera] |
| Gallinule | - Purple Gallinule | [Porphyrio martinica] |
| Gannet | - Northern Gannet | [Morus bassanus] |
| Garganey | - Garganey | [Anas querquedula] |
| Gnatcatcher | - Black-tailed Gnatcatcher | [Polioptila melanura] |
| Gnatcatcher | - Blue-gray Gnatcatcher | [Polioptila caerulea] |
| Godwit | - Bar-tailed Godwit - Asian | [Limosa lapponica baueri] |
| Godwit | - Bar-tailed Godwit - European | [Limosa lapponica laponnica] |
| Godwit | - Hudsonian Godwit | [Limosa haemastica] |
| Godwit | - Marbled Godwit | [Limosa fedoa] |
| Golden-Plover | - American Golden-Plover | [Pluvialis dominica] |
| Golden-Plover | - Eurasian Golden-Plover | [Pluvialis apricaria] |
| Golden-Plover | - Pacific Golden-Plover | [Pluvialis fulva] |
| Goldeneye | - Barrow's Goldeneye | [Bucephala islandica] |
| Goldeneye | - Common Goldeneye | [Bucephala clangula] |
| Goldfinch | - American Goldfinch | [Carduelis tristis] |
| Goldfinch | - European Goldfinch | [Carduelis carduelis] |
| Goldfinch | - Lesser Goldfinch - Black-backed | [Carduelis psaltria psaltria] |
| Goldfinch | - Lesser Goldfinch - Green-backed | [Carduelis psaltria hesperophilus] |
| Goose | - Barnacle Goose | [Branta leucopsis] |
| Goose | - Bean Goose | [Anser fabalis] |
| Goose | - Cackling Goose | [Branta hutchinsii] |
| Goose | - Canada Goose - Eastern | [Branta canadensis canadensis] |
| Goose | - Emperor Goose | [Chen canagica] |
| Goose | - Greater White-fronted Goose - Greenland | [Anser albifrons flavirostris] |
| Goose | - Greater White-fronted Goose - Siberian | [Anser albifrons albifrons] |
| Goose | - Greater White-fronted Goose - Tundra | [Anser albifrons ??] |
| Goose | - Greylag Goose | [Anser anser] |
| Goose | - Lesser White-fronted Goose | [Anser erythropus] |
| Goose | - Nene (Hawaiian Goose) | [Branta sandvicensis] |
| Goose | - Pink-footed Goose | [Anser brachyrhynchus] |
| Goose | - Snow Goose - Blue Phase | [Chen caerulescens ??] |
| Goose | - Snow Goose - White Phase | [Chen caerulescens ??] |
| Goshawk | - Northern Goshawk | [Accipiter gentilis] |
| Grackle | - Boat-tailed Grackle - Atlantic | [Quiscalus major torreyi] |
| Grackle | - Boat-tailed Grackle - Gulf Coast | [Quiscalus major major] |
| Grackle | - Common Grackle | [Quiscalus quiscula] |
| Grackle | - Great-tailed Grackle | [Quiscalus mexicanus] |
| Grebe | - Clark's Grebe | [Aechmophorus clarkii] |
| Grebe | - Eared Grebe | [Podiceps nigricollis] |
| Grebe | - Great Crested Grebe | [Podiceps cristatus] |
| Grebe | - Horned Grebe | [Podiceps auritus] |
| Grebe | - Least Grebe | [Tachybaptus dominicus] |
| Grebe | - Little Grebe | [Tachybaptus ruficollis] |
| Grebe | - Pied-billed Grebe | [Podilymbus podiceps] |
| Grebe | - Red-necked Grebe | [Podiceps grisegena] |
| Grebe | - Western Grebe | [Aechmophorus occidentalis] |
| Greenfinch | - European Greenfinch | [Carduelis chloris] |
| Grosbeak | - Black-headed Grosbeak | [Pheucticus melanocephalus] |
| Grosbeak | - Blue Grosbeak | [Passerina caerulea] |
| Grosbeak | - Crimson-collared Grosbeak | [Rhodothraupis celaeno] |
| Grosbeak | - Evening Grosbeak | [Coccothraustes vespertinus] |
| Grosbeak | - Pine Grosbeak | [Pinicola enucleator] |
| Grosbeak | - Rose-breasted Grosbeak | [Pheucticus ludovicianus] |
| Ground-Dove | - Common Ground-Dove | [Columbina passerina] |
| Grouse | - Dusky Grouse - Southern Rockies | [Dendragapus obscurus richardsonii] |
| Grouse | - Red Grouse | [Lagopus lagopus scoticus] |
| Grouse | - Ruffed Grouse | [Bonasa umbellus] |
| Grouse | - Sharp-tailed Grouse | [Tympanuchus phasianellus] |
| Grouse | - Spruce Grouse | [Falcipennis canadensis] |
| Guillemot | - Black Guillemot | [Cepphus grylle] |
| Guillemot | - Pigeon Guillemot | [Cepphus columba] |
| Gull | - Black-headed Gull | [Larus ridibundus] |
| Gull | - Bonaparte's Gull | [Larus philadelphia] |
| Gull | - California Gull | [Larus californicus] |
| Gull | - Common Gull - European | [Larus canus canus] |
| Gull | - Glaucous Gull | [Larus hyperboreus] |
| Gull | - Glaucous-winged Gull | [Larus glaucescens] |
| Gull | - Great Black-backed Gull | [Larus marinus] |
| Gull | - Heermann's Gull | [Larus heermanni] |
| Gull | - Herring Gull - European | [Larus argentatus argentatus] |
| Gull | - Herring Gull - North American | [Larus argentatus smithsonianus] |
| Gull | - Iceland Gull - Kumlien's | [Larus glaucoides kumlieni] |
| Gull | - Iceland Gull - Nominate | [Larus glaucoides glaucoides] |
| Gull | - Laughing Gull | [Larus atricilla] |
| Gull | - Lesser Black-backed Gull | [Larus fuscus] |
| Gull | - Little Gull | [Larus minutus] |
| Gull | - Mew Gull | [Larus canus brachyrhynchus] |
| Gull | - Ring-billed Gull | [Larus delawarensis] |
| Gull | - Saunders's Gull | [Larus saundersi] |
| Gull | - Slaty-backed Gull | [Larus schistisagus] |
| Gull | - Western Gull | [Larus occidentalis] |
| Gyrfalcon | - Gyrfalcon | [Falco rusticolus] |