Aristaria nigrifrons 
Aristobia horridula 
Aristolochia bottae 
Aristolochia fontanesii 
Aristolochia indica 
Aristolochia paucinervis 
Aristolochia scabridula 
Aristotelia pudibundella 
Aristotle's Duke 
Arizona bark scorpion 
Arizona Bird-dropping Moth 
Arizona Black Rattlesnake 
Arizona gray squirrel 
Arizona lupine 
Arizona Mariposa Lily 
Arizona Mud Turtle 
Arizona Poppy 
Arizona Tan Mantis 
Arizona Tree Frog 
Arkys transversus 
Armadillidium granulatum 
Armed anemone 
Armed Spiny Ant 
Armenian gull