Tau Empire.

The Tyranids are a race of Warhammer 40,000. Caring nought for individual deaths, the Tyranids act as a whole organism, attacking and devouring any creature that comes in their way.

From Games WorkshopEdit

"An alien horror from beyond the galactic void, the Tyranids are an insatiable menace that devours all in their path. Travelling in vast Hive Fleets the Tyranids are systematically consuming all in their path as they encroach further into the galaxy. In battle they fight with detached, alien ferocity, caring nothing for casualties suffered, merely overwhelming their foes with an endless tide of bio-engineered monstrosities."