The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Amphibian (0 members)
- Amphibians (9 members)
- Ancient Fish (5 members)
- Animal (0 members)
- Animals (91 members)
- Bears (5 members)
- Big cats (1 member)
- Birds (0 members)
- Brachiopods (6 members)
- Candidates for deletion (2 members)
- Candidates for speedy deletion (0 members)
- Canines (8 members)
- Cephalopod (4 members)
- Challenge (1 member)
- Citation needed (0 members)
- Cleanup (0 members)
- Community (4 members)
- Controls (1 member)
- Copyright templates (12 members)
- Coral (11 members)
- Dinosaur images (24 members)
- Dinosaurs (18 members)
- Disambiguations (0 members)
- Documentation templates (53 members)
- Episodes (3 members)
- Fish (30 members)
- Formatting templates (22 members)
- Front page sections (3 members)
- Game (6 members)
- Game developers (1 member)
- Happy Birthdays (11 members)
- Happy Birthdays Wiki (8 members)
- Hidden categories (0 members)
- Icons (9 members)
- Images (8 members)
- Images needing improvement (0 members)
- Infobox templates (4 members)
- Infoboxes lacking images (1 member)
- Insects (13 members)
- Item templates (3 members)
- Items (23 members)
- Jellyfish (7 members)
- Land Organisms (69 members)
- Leafy Plant (0 members)
- Leafy Plants (10 members)
- Legal notices (3 members)
- Life images (235 members)
- Mammals (5 members)
- Media (2 members)
- Missions (5 members)