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From Warhammer 40k - Lexicanum
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The major alien races are the [[Ork]]s, [[Eldar]], [[Dark Eldar]], [[Tyranid]]s, [[Necron]]s and the [[T'au]]. All these races pose a considerable threat to the survival and continued dominance of mankind. There are countless other races but all are trivial by comparison.{{citethis}}
The [[Imperium]] considers humanity the rightful rulers of the whole [[galaxy]]. Part of the [[Imperial Creed]] is that all aliens judged to pose a threat to mankind's survival must be contained or destroyed. Aliens, along with mutants, heretics and deviants, are all considered enemies of mankind, for they threaten the very survival of the human race.{{citethis}} Nearly all xenos tend to be feared or and hated by most Imperials. This results in a xenos' disadvantage when engaging most Imperials in a social or diplomatic context.{{Fn|9}}
Many new alien races and civilisations are discovered by Imperial [[Explorator]]s every year. For the most part, these aliens are ignored, contained, or if they present a threat to mankind or the Imperium, eradicated. Throughout its history the Imperium has fought many long wars with dangerous alien species. In most cases the Imperium has eventually won, but in some, the threat has only managed to be contained.{{Fn|2}}
