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| Type | Common Name | [Latin Name] |
| Albatross | - Laysan Albatross | [Phoebastria immutabilis] |
| Anhinga | - Anhinga | [Anhinga anhinga] |
| Ani | - Groove-billed Ani | [Crotophaga sulcirostris] |
| Ani | - Smooth-billed Ani | [Crotophaga ani] |
| Antbird | - Chestnut-backed Antbird | [Myrmeciza exsul] |
| Antbird | - Ocellated Antbird | [Phaenostictus mcleannani] |
| Antshrike | - Barred Antshrike | [Thamnophilus doliatus] |
| Antshrike | - Fasciated Antshrike | [Cymbilaimus lineatus] |
| Antshrike | - Western Slaty Antshrike | [Thamnophilus atrinucha] |
| Ant-Tanager | - Red-throated Ant-Tanager | [Driophlox fuscicauda] |
| Antwren | - Dot-winged Antwren | [Microrhopias quixensis] |
| Auklet | - Crested Auklet | [Aethia cristatella] |
| Auklet | - Least Auklet | [Aethia pusilla] |
| Auklet | - Parakeet Auklet | [Aethia psittacula] |
| Avocet | - American Avocet | [Recurvirostra americana] |
| Avocet | - Pied Avocet | [Recurvirostra avosetta] |