| Common Name | Scientific Name | Class | Order | Family |
|---|---|---|---|---|
| Abramis brama | Abramis brama | Actinopterygii | Cypriniformes | Cyprinidae |
| Accipiter nisus | Accipiter nisus | Aves | Accipitriformes | Accipitridae |
| Acinonyx jubatus | Acinonyx jubatus | Mammalia | Carnivora | Felidae |
| Acrocephalus scirpaceus | Acrocephalus scirpaceus | Aves | Passeriformes | Acrocephalidae |
| Agrionemys horsfieldii | Agrionemys horsfieldii | Reptilia | Testudines | Testudinidae |
| Ailurus fulgens | Ailurus fulgens | Mammalia | Carnivora | Ailuridae |
| Alca torda | Alca torda | Aves | Charadriiformes | Alcidae |
| Alces alces | Alces alces | Mammalia | Cetartiodactyla | Cervidae |
| Aldabrachelys gigantea | Aldabrachelys gigantea | Reptilia | Testudines | Testudinidae |
| Alligator mississippiensis | Alligator mississippiensis | Reptilia | Crocodilia | Alligatoridae |
| Alouatta palliata | Alouatta palliata | Mammalia | Primates | Atelidae |
| Alouatta seniculus | Alouatta seniculus | Mammalia | Primates | Atelidae |
| Ammospermophilus harrisii | Ammospermophilus harrisii | Mammalia | Rodentia | Sciuridae |
| Anas platyrhynchos | Anas platyrhynchos | Aves | Anseriformes | Anatidae |
| Anser anser domesticus | Anser anser domesticus | Aves | Anseriformes | Anatidae |
| Anthus spinoletta | Anthus spinoletta | Aves | Passeriformes | Motacillidae |
| Antilocapra americana | Antilocapra americana | Mammalia | Cetartiodactyla | Antilocapridae |
| Antilope cervicapra | Antilope cervicapra | Mammalia | Cetartiodactyla | Bovidae |
| Aonyx cinerea | Aonyx cinerea | Mammalia | Carnivora | Mustelidae |
| Aonyx cinereus | Aonyx cinereus | Mammalia | Carnivora | Mustelidae |