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Many believe that chestbursters, while still in an embryonic stage, use the host's DNA to augment its own and acquire any useful traits that the host garnered through natural selection. This makes sense from an evolutionary standpoint, since the host is adapted to its environment, taking on some of its characteristics would further adapt the newborn alien to its new environment. This would essentially make all adult xenomorphs hybrid creatures. This idea was used in some novel and comic book spin-offs. Another explanation could be that since the eggs seem to be produced asexually, the embryo receives some of its chromosomes from its host to allow for biodiversity of the species.
Alien 3 furthered this by having an alien embryo implanted into a dog, though it was an ox that pulled the EEV that was 'impregnated' in the original script. The xenomorphs of the first two films were all implanted in humans, and thus could walk in a bipedal formation; they also had foot-long spikes on their backs. The "dog-alien" of Alien 3 was visually very different from these, because it took on some of the DNA of its canine host. It appeared and moved in a somewhat panther-like way, did not have spikes on its back, was far more streamlined in appearance, and ran incredibly fast on four legs, rarely standing on two.
The xenomorphs of fourth Alien film were something of an exception, because they were far more human-like, to the point that the Alien Queen gave live birth to a "human-alien Hybrid": this was all because these aliens were created as the result of cloning experiments by the military, and were not the "true" form of the species, having admittedly been spliced with much human DNA. However, this was not as a result of the normal implantation-DNA assimilation process.
In various comics and the "Alien vs. Predator" video game series, this is taken a step further when a xenomorph embryo is implanted into a Yautja (Predator); the result is an Alien with Predator characteristics, a "Pred-alien". This hybrid stood on two legs, and had the basic body-outline of a Predator, having lost the elongated head shape. It also lacked the inner set of jaws characteristic of other xenomorphs, but sported a set of mandibles reminiscent of those of the Predator. This motif was also repeated at the end of the recent AvP: Aliens vs Predator film, largely based on the comic books and the video game series and written by the director of Resident Evil.
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