Abandoned-web orb-weaver 
Abdopus aculeatus 
Abisara geza 
Abrosoma festinatum 
Abrosoma gibberum 
Acanthocoris scabrator 
Acanthurus nigricauda 
Acetabularia major 
Achaeus spinosus 
Acherontia lachesis 
Achilles tang 
Achrioptera manga 
Ackee apple 
Acoel Flatworm 
Acosmeryx anceus 
Acosmeryx castanea 
Actias philippinica 
Adelidoria glauca 
Aegires villosus 
Aeschynanthus tricolor 
Aethaloessa calidalis 
African buffalo 
African bullfrog 
African bush elephant