Awapuhi 
Awl-headed Snake 
Awl-leaf wattle 
Axarus festivus 
Axis deer 
Axolotl 
Aye-aye 
Ayres' Stone Grasshopper 
Ayuthia spectabile 
Azalea Caterpillar Moth 
Azalea Gall 
Azalea leaf miner 
Azalea Plant Bug 
Azalea sphinx 
Azaras Agouti 
Azaras Spinetail 
Azarole 
Azochis curvilinearis 
Azochis phillips 
Azorella pedunculata 
Azores chromis 
Azorian Large White 
Aztec Spur-throat 
Aztec tobacco