Ada's planarian 
Adalia conglomerata 
Adams gem 
Adamsia palliata 
Adamsonia za 
Adanson's House Jumper 
Adansonia grandidieri 
Adansonia kilima 
Adansonia madagascariensis 
Adansonia rubrostipa 
Adapantus nitens 
Addax 
Adder's-tongue 
Addison's Leather Flower 
Adejeania vexatrix 
Adela australis 
Adela caeruleella 
Adelaide trapdoor spider 
Adelaide's warbler 
Adelidoria glauca 
Adélie penguin 
Adeloneivaia jason 
Adeloneivaia subangulata 
Adelpha basiloides