Adanson's House Jumper 
Adapantus nitens 
Addax 
Adejeania vexatrix 
Adela australis 
Adela caeruleella 
Adelaide trapdoor spider 
Adelaide's warbler 
Adelidoria glauca 
Adélie penguin 
Adeloneivaia jason 
Adeloneivaia subangulata 
Adelpha basiloides 
Adelpha justina 
Adelpha malea 
Adelpha olynthia 
Adelpha saundersii 
Aden Skipper 
Adesmia cancellata 
Adhemarius gannascus 
Adhemarius sexoculata 
Adhemarius ypsilon 
Adhesive anemone 
Adiathetus shelfordi