Outwardly, they are encased in a tough mesoskeleton, lending them a skeletal, biomechanical appearance, and are usually colored in muted shades of black, blue or bronze. However, regardless of any physical variation resulting from the host, Xenomorphs always possess certain distinctive, trademark characteristics.

Perhaps the most notable of these variations is the ' Predalien', the result of a Xenomorph gestating inside a Yautja. Historically, most Xenomorphs encountered have typically gestated inside human hosts, and therefore adopt a basically bipedal, humanoid stance, but other variations born from a wide variety of different host organisms have been seen, and as a result feature varying physical appearances. This ability to alter its form based on the host's physical attributes occurs at a cellular level and has been referred to as the ' DNA reflex'. Notably, Xenomorphs will alter their physical appearance during development depending on the physiology of the host in which they gestate – in all likelihood, this incorporation of physical traits gleaned from the host is designed to ensure the adult creature is better suited to the environment in which it will find itself. ' Its structural perfection is matched only by its hostility.' ― Ash, regarding The Alien (from Alien) The Yautja revere the creatures as incredibly dangerous and thus highly worthy prey, notably employing them in initiation Hunts that serve to test young members of their society and mark their progression into adulthood. The creatures are known for their potent acidic blood and their pharyngeal jaws, although their biological life cycle, in which their offspring are implanted inside living hosts before erupting violently from their chests, is in many ways their signature aspect.Īside from their repeated conflicts with humans, Xenomorphs have notably been associated with the Yautja, who know them as kainde amedha ('hard meat'). Like wasps or bees, Xenomorphs are eusocial, with a fertile Queen breeding a host of subordinate castes. The Xenomorphs are vicious predatory creatures with no higher goals than the propagation of their species and the destruction of any life that could pose a threat to them.

Xenomorph XX121, commonly referred to as simply the Xenomorph, known colloquially as the Alien, and classified as XX121, is a highly aggressive endoparasitoid extraterrestrial species. Kiande amedha ('hard meat') (Yautja language)

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