Acute Sedge 
Acyphas chionitis 
Acyrthosiphon kondoi 
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