Creatures that breathe in oxygen and breathe out carbon dioxide (e.g. humans, dogs, cats, etc:)
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- Sabre Cat (Elder Scrolls)
- Saiyan
- Salamence
- SCP-049
- SCP-682
- SCP-939
- SCP-966
- SCP-999
- Shelgon
- Shieldon
- Short-Beaked Echidna
- Siberian Tiger
- Siberian Unicorn
- Sker Buffalo
- Skunk ape
- Snow Leopard
- Snow Wasset
- Snowstalker
- Southern Tamandua
- Specifician House
- Spectacled Bear
- Speedemon
- Spirit Tiger
- Spotted Hyena
- Striped Biologist-Taunter
- Striped skunk
- Superhuman
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