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'''Bio-ships''' are the living spacecraft making up the [[Tyranid]] [[Hive Fleet]]s. Although bio-ships take on a seemingly endless variety of forms, they are broadly divided by the [[Imperium]] into three several major classes depending on its general role in the Hive Fleet. The ships are also factories producing the different [[Species of Tyranid]] used in ground invasions. The ships themselves are essentially the largest species of Tyranid and are controlled by the [[Hive Mind]].