Genestealers employ stealth and cunning to infiltrate other species. They infect a planet's fauna with Tyranid genetic material, creating hybrid creatures under the control of a Genestealer Broodlord or the Tyranid Hive Mind. They hide on abandoned Space Hulks or within Warp-capable vessels' cargo holds. They also infect Orks when other hosts are unavailable. Genestealers share a psychic link, the Broodmind, and actively seek psykers as hosts to enhance this connection and their Tyranid psychic abilities.