The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 2023 Species (1 member)
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- ARK Island Inhabitants (1 member)
- A Bug's Life (0 members)
- A Sound of Thunder (0 members)
- Aardvarks (1 member)
- Abstractians (1 member)
- Abydos Inhabitants (1 member)
- Abyssal Planes Inhabitants (1 member)
- Abyssovermes (1 member)
- Accipitrids (1 member)
- Accipitriformes (1 member)
- Aceratheres (1 member)
- Adocids (1 member)
- AdventureQuest (1 member)
- Africa Inhabitants (40 members)
- Afrotherians (8 members)
- After Man (2 members)
- Ailurids (4 members)
- Ailuropods (2 members)
- Ailurus (1 member)
- Air-Breathing Snails (1 member)
- Akavir inhabitants (1 member)
- Aladdin (1 member)
- Alaska Inhabitants (10 members)
- Alberta Inhabitants (3 members)
- Aldebaran System Inhabitants (1 member)
- Aliens (6 members)
- Aliens vs. Predator (5 members)
- All Species Wiki (1 member)
- Allioids (1 member)
- Allucaneet Kingdom Inhabitants (1 member)
- Alola Inhabitants (16 members)
- Alsace Inhabitants (1 member)
- Alterac Mountains Inhabitants (1 member)
- Alternate Phantomile Inhabitants (1 member)
- Alternative earth (5 members)
- Amalgia Inhabitants (1 member)
- Amaryllids (1 member)
- Amazon Rainforest Inhabitants (2 members)
- Ambelodons (1 member)
- American Greetings (1 member)
- American McGee's Alice (6 members)
- Amnesia: The Dark Decent (1 member)
- Among Us (2 members)
- Amorphoculids (1 member)
- Amorphs (28 members)
- Amostra Inhabitants (1 member)