| Common Name | Scientific name |
|---|---|
| Gray-headed Piprites | Piprites griseiceps |
| Gray-headed Tanager | Eucometis penicillata |
| Gray-hooded Gull | Chroicocephalus cirrocephalus |
| Gray-lined Hawk | Buteo nitidus |
| Gray-rumped Swift | Chaetura cinereiventris |
| Gray-streaked Flycatcher | Muscicapa griseisticta |
| Gray-throated Chat | Granatellus sallaei |
| Gray-throated Leaftosser | Sclerurus albigularis |
| Grayish Saltator | Saltator coerulescens |
| Great Antshrike | Taraba major |
| Great Auk | Pinguinus impennis |
| Great Black Hawk | Buteogallus urubitinga |
| Great Black-backed Gull | Larus marinus |
| Great Blue Heron | Ardea herodias |
| Great Bustard | Otis tarda |
| Great Cormorant | Phalacrocorax carbo |
| Great Crested Flycatcher | Myiarchus crinitus |
| Great Crested Grebe | Podiceps cristatus |
| Great Crested Tern | Thalasseus bergii |
| Great Curassow | Crax rubra |
| Great Egret | Ardea alba |
| Great Frigatebird | Fregata minor |
| Great Green Macaw | Ara ambiguus |
| Great Grey Owl | Strix nebulosa |
| Great Grey Shrike | Lanius excubitor |
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