The Facehugger greatly resembles a pair of skeletal hands fused together, with a spine-like tail. It has eight long, finger-like legs which allow it to crawl rapidly, and a long . The underside of the Facehugger and its orifice (from which extends a proboscis used for delivering the Xenomorph chestburster noticeably resemble a human female's inner intimate part.

It is most well known for its horrific method of gestation – it is implanted into a host lifeform's chest cavity by a Facehugger, and upon maturing it will erupt violently from the host's chest, killing them in an incredibly bloody and traumatic fashion. Chestbursters are small, generally not more than a foot tall and around two feet long including their tails, although larger examples have been seen. Chestbursters resemble large worms, beige or brown in color and with a mouth of metallic teeth and a tail capable of propelling the creature at considerable speed. They can also erupt from the womb or stomach multiple at a time in this case

A Predalien is a hybrid creature from the Alien vs. Predator franchise, resulting from a Xenomorph facehugger impregnating a Predator host. It combines traits from both species, featuring Xenomorph characteristics like a biomechanical appearance and inner jaw, but with Predator features such as mandibles, dreadlocks, and a more robust, taller build. Predaliens are considered abominations by Predators and are known for their enhanced strength, intelligence, and ability to produce multiple chestbursters inside a hosts Womb or Stomach