Question: what are xenomorphs based on?
Answer: The Xenomorph XX121, better known just as Xenomorph (which literally translates to "strange form" from Greek ξενος, xenos=strange and morphe=form) or the "Alien", is an extraterrestrial hive-based endoparasitoid species with a multi-staged life cycle, possibly originating from the planet Xenomorph Prime.