A harkhive is a fictional concept from the "Warhammer 40,000" universe, specifically associated with the Tyranids, a race of alien organisms. It refers to a massive, mobile bio-ship that functions as a hive for Tyranid organisms, serving as a center for their reproductive and strategic operations. Harkhives are capable of consuming entire planets to sustain their hive fleets and are a crucial part of the Tyranid's relentless pursuit of biomass across the galaxy.