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[[Image:Tyranid Capillary Towers.jpg|thumb|right|Tyranid Capillary Towers]]
'''Capillary Towers''' , also called '''Feeding Towers''', are a [[Tyranid]] bioform that acts as reservoirs of for biomass collected by their collection, transference, and birthing pools for Tyranids swarms during an assaulttheir predatory assaults on a world. These potentially monolithic bioforms erupt from a world's crust{{Fn|2a}} and form sites that are ultimately collected by a [[bioship]] in low orbit. The ship's feeding system consists of many titanic tubes{{Fn|2c}} twisted together to make up multi-pronged system of proboscises.{{Fn|1}}
The latter stages of a Tyranid invasion, being the "consumption" and "assimilation" stages, is marked by enormous capillary towers and bio-ships deploying their feeding tubes. This typically marks the death of a world where the only recourse is [[exterminatus]]. However, it's also typically when bio-ships and [[hive ship]]s are most vulnerable, having likely expended a significant amount of biomass in their initial assault. Destroying or damaging the Tyranid Hive Fleet (via exterminatus or other means) while it is feeding can potentially deny the hive fleet biomass to fuel to renew its assault. Destroying the towers or feeding tubes before the biomass reaches a bioship would deny the fleet valuable biomass to assimilate. Thus leaving the hive fleet as a whole, in a weaker state.{{Fn|2c}}
