In psychology, aggression refers to behavior between members of the same species that is intended to cause pain or harm.
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A
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- Alien (Aliens vs. Parker)
- Alien (Attack the Block)
- Alien (Final Days of Planet Earth)
- Alien (Monsters)
- Alien (Spielberg's War of the Worlds)
- Alien Bear
- Alien Guard
- Alienator (Totally Spies)
- Allicon
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- Ambull
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- Andalite
- Androgum
- Anibot
- Animal (Animal Wars)
- Antonio's Species
- Evolved Ape
- Apothicon
- Appoplexian
- Evolved Appoplexian
- Aquatican
- Arburian Carcharodon
- Ardilus
- Argonoid
- Asteromorph
- Atasian
- Aura Beasts
B
- Baalgar
- Babarian
- Babs
- Bane
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- Baron of Hell
- Bashmouth's Species
- Batarian
- Beast's Species
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- Black Arms
- Blarg
- Blatarian
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- Blood Tribe
- Bloodliner
- Blue-furred Feline
- Boar-wolf
- Bos
- Boskara
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- Bronteroc
- Broodwarrior
- Brotean
- Brutal Tide
- Bullsquid
- Bulrathi
- Burning Martian
C
D
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- Daemon (Warhammer 40,000)
- Dark Eldar
- Dark Elf
- Dark Truder
- Darlok
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- Decka's Species
- Demogorgon
- Demon (Doom)
- Demons (Nanatsu no Taizai)
- Detrovite
- Deviant
- Devourer (Lanfeust of Troy)
- Dheronian
- Dire Wraith (Transformers)
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- Draedan
- Dragon Bolt
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- Drej
- Drophyd
- Dug
- Dweller (Transformers: EarthSpark)
- DynaMite
E
F
G
- Garblovian
- Garoga
- Gatekeeper (Dream Merchant)
- Geonosian
- Gigantobot
- Gizurean
- Glorft
- Goa'uld
- Goblin (Goblin Slayer)
- Goblin (The Galactic Navy Officer Becomes an Adventurer)
- Godkiller
- Goobler
- Gordanian
- Gorge
- Gorn
- Grabber
- Gracklflint
- Gray Alien (V/H/S/2)
- Grazlaa
- Green Martian (Barsoom)
- Grendarl
- Grungarian
- Guardian (Halo)
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- Gundark
- Gweld
H