Encyclopedias, Almanacs, Transcripts, and Maps
- Spade-Headed Wormlizards (Trogonophidae)
- Spadefoot Toads (Pelobatidae)
- spadix
- Spanish art
- Spanish Sahara
- Sparrows (Passeridae)
- spathe
- Spawning Aggregations
- Special Use Permit
- Species Introduction
- speedwell
- Spektor, Yits?aq El?anan
- Spelaeogriphacea (Spelaeogriphaceans)
- Spells
- Spencer, Herbert
- Sperm Whales (Physeteridae)
- Sphenisciformes (Penguins)
- Sphenodontia Tuatara (Sphenodontidae)
- spherical trigonometry
- spider monkey