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 (Attack the Block)
- Alien (Spielberg's War of the Worlds)
- Alien Bear
- Alienator (Totally Spies)
- Andalite
- Androgum
- Apothicon
- Appoplexian
- Evolved Appoplexian
- Aquatican
- Ardilus
- Argonoid
- Atasian
- Aura Beasts
B
- Babarian
- Babs
- Bane
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- Baron of Hell
- Bashmouth's Species
- Batarian
- Blarg
- Blatarian
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- Blood Tribe
- Bloodliner
- Bos
- Boskara
- Broodwarrior
- Brotean
- Brutal Tide
- Bullsquid
- Bulrathi
- Burning Martian
C
- Cacodemon
- Capelon
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- Chalnoth
- Cheron Native
- Chevin
- Chimera Ants
- Chinorr
- Collector
- Colud Qwetuon
- Covenant
- Cragmite
- Craver
- Creatures of the Mist
- Cyberdemon
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- Cycloid
- Cycro
D
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- Daemon (Warhammer 40,000)
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- Dark Elf
- Darlok
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- Decka's Species
- Demodog
- Demogorgon
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- Demon (DOOM)
- Demons (Nanatsu no Taizai)
- Detrovite
- Devourer (Lanfeust of Troy)
- Dheronian
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- Draedan
- Dragon Bolt
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- Drej
- Drophyd
- Dug
- DynaMite
E
F
G
- Garblovian
- Garoga
- Gatekeeper (Dream Merchant)
- Gizurean
- Glorft
- Goa'uld
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- Gorge
- Grabber
- Gracklflint
- Grazlaa
- Green Martian (Edgar Rice Burroughs)
- Grendarl
- Grungarian
- Guardian (Halo)
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- Gundark
- Gweld
H
I
J
K
- K'tang Kaktorri
- Kagouti
- Kalderan
- Karaki
- Kazon
- Kett
- Kharaa
- Kibrani
- Kihunter
- Klingon
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- Krael
- Krafayis
- Kriken
- Krill (The Orville)
- Krogan
- Krykna
- Kylothian
- Kzin
L
- Lake Thresher
- Laurian
- Lawbringer
- Leaf Dragon
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- Leviathan (Supernatural)
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- Locust
- Long Haired Creatures (Inside)
- Lord Vine-Class Assassin Clone Sprout
- Lost Souls
M
- Magma Cube
- Magog
- Mangalore
- Mar
- Maxilonian
- Mazzadril
- Mighty Mandrake
- Monk of Klaa
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- Moorwen
- Mortalen
- Mouse (The Hitchhiker's Guide to the Galaxy)
- Mutraddi
N
- Nanophyte
- Naxxilian
- Necromorph
- Necron
- Negatoid
- Neosapien
- Nexu
- Nietzschean
- Nivopantamian
- Nodulian
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O
- O'reenian
- Octoboo
- Octoguy
- Octoomba
- Octopus (Super Mario Galaxy)
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- Old Gods
- Onbaa
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- Ork
- Outsider
P
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