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From Warhammer 40k - Lexicanum
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→Dispersion
===Dispersion===
[[Image:40k-309-Island.jpg|thumb|right|Capillary towers funnel surround a bioship feeding tendril as it consumes aquatic biomass to the [[Hive Ships]] in orbit.{{Fn|7b}}]]
Spores that can later become capillary towers are seeded by Tyranid bioforms as they burrow, such as [[Trygon]]s and [[Mawloc]]s. The towers absorb any organism or organic matter they are in contact with, growing quickly from the ground. These towers are often seen in the Tyranid backlines and their biomass reserves are used to birth additional bioforms in a world's assault.{{Fn|2a}} Their powerful metabolic filtration systems draw in all biomass,{{Fn|2c}} causing the thinning air of a world to blow directly towards the largest nearby tower.{{Fn|5}}
