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[[Image:Tyranid Capillary Towers.jpg|thumb|right|Tyranid Capillary Towers]]
'''Capillary Towers''' are a [[Tyranid]] bioform that acts as reservoirs of for biomass collected by their swarms during an assault. 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}}
Large capillary towers and hive ships extending their feeding tubes typically marks the latter stages of a Tyranid invasion, being consumption and assimilation. Although this typically marks the death of a world, it's also the point at which a hive fleet's bioships are most vulnerable, more-so than at any other stage in an invasion. Destroying or damaging the feeding system during this fleeting window can deny the hive fleet biomass for a new assault. Attacking before the biomass reaches a bioship and is assimilated by a bioship leaves it, and the hive fleet as a whole, in a weaker state.{{Fn|2c}}
