Xenomorph (Earth-8756)

The xenomorphs, designated as LF.Xx.3273 by the forerunners (Latin Linguafoeda acheronsis meaning "foul tongue from Acheron"), and referred to as the parasite, the serpents, and the Parasite by the Covenant species, are a highly aggressive sapient endoparasitoid species that can quickly reproduce and grow through the infection or impregnation of other species with sufficient cognitive capabilities. With origins shrouded in mystery and uncertainty, xenomorphs reproduce by spreading its infection towards other organisms, hijacking their bodies and impregnating them with a Chestburster, which in turns is converted into one of the species' many specialized forms. By impregnating other species, xenomorphs become increasingly more intelligent, and because of their frighteningly rapid growth rate, they are effectively unstoppable.