In psychology, aggression refers to behavior between members of the same species that is intended to cause pain or harm.
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Aatheriexa
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Abomination (Fallout)
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Alien (Attack the Block)
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Alien (Final Days of Planet Earth)
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Alien (Spielberg's War of the Worlds)
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Alien Bear
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Alienator (Totally Spies)
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Ancestral (Doom)
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Andalite
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Androgum
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Evolved Ape
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Apothicon
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Appoplexian
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Evolved Appoplexian
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Aquatican
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Ardilus
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Argonoid
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Atasian
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Aura Beasts
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