In psychology, aggression refers to behavior between members of the same species that is intended to cause pain or harm.
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- Saibaman
- Sail Person
- Saiyan
- Sakkra
- Sand Ripper
- Saurian (Sigil)
- Scarran
- Schniarfeur
- Sebacean
- Shadow (Babylon 5)
- Shadow Kin
- Shakturi
- Sharkticon
- Shelled Grollusc
- Shocker
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- Shroob
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- Shrubdubs
- Silastic Armourfiend
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- Skaarj
- Skaven
- Skelteg
- Skitter
- Skrull
- Slaughterfish
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- Slyther
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- Space Amoeba (Stellaris)
- Space Dragon
- Space Marine (Warhammer 40,000)
- Spino
- Squiggoth
- Squiz-Quijy
- Ssamb
- Sslyth
- Sta'abi's Species
- Steelpecker
- Stentarian
- Stenza
- Stinkworm
- Stone Creature
- Strogg
- Strong Sunflower
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- Tangean Grounder
- Tao Tei
- Tareeg
- Taxxon
- Teetonian
- Terminid
- Terraformar
- Terraklon
- Terrorcon (Transformers: Prime)
- Tetramand
- The Entity (Strife)
- The Flood
- Thorian (Alien Property)
- Thresher Maw
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- Thrint
- Thyrrus
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- Topman
- Trans-Galactic Empire
- Transmetal 2
- Tremor
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- Tritonian Yeti
- Trogg
- Troll (Homestuck)
- Troll (Kingmaker)
- Troll (Lanfeust of Troy)
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- Tusken Raider
- Tyhrranoid
- Typhon (Prey)
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