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However, the novelization of the film explains that the detonation of an Atmosphere Processor does not create any radioactive fallout, and in Stasis Interrupted Michael Weyland reveals that all of the Xenomorph specimens at the colony were destroyed when the Atmosphere Processing Plant exploded.
A further theory is that the Raven and the other new Xenomorphs in the game are the results of the radiation from the explosion of the Atmosphere Processing Plant in Aliens. However, the length of time between the derelict crashing and the events of Aliens: Colonial Marines makes this unlikely, as the creature would have to be over 2,000 years old while Eggs have been known to survive that long, it is unknown if adult Xenomorphs can do the same. Considering the large size of the Raven compared to other Xenomorphs, and its distinct appearance, some have theorized that this is the creature that emerged from the chest of the Pilot aboard the derelict, this means that it could be a Jockey-Xenomorph. The human features of the Raven's "face" were likely inspired by the design of the original Alien in Alien, which included a human skull at the front of its head as part of its design (although this was not easily visible in the final film). There is no possible way it can be harmed or killed before its scripted fight and so until the player confronts it in a Power Loader, they can only outrun it and avoid it at all costs. The Raven is a massive Xenomorph that is immune to bullets and other forms of damage. The Raven can also be heard making a "snarl" noise characteristic to Lurkers at times, further hinting that Lurkers may be a leadership caste. Unlike most Xenomorph castes, which produce screeching and hissing vocalizations, the Raven can produce an extremely loud, deep roar which can be heard across long distances. The Raven is very large, even for a Xenomorph, with a height comparable to that of a Praetorian or even a Queen. This strain of Xenomorph also lacks the large canine teeth of Praetorians and Queens, making its teeth blunt and noticeably more human-like - with two small tusk-like protrusions either side of its lower jaw. The Raven's face is scarred, exposing evidence of human features beneath the skin, including eye sockets, a nasal cavity and jaws and teeth that are significantly more human in appearance than on most other Xenomorphs the teeth themselves are not silver and metallic as on most Xenomorph variants.
Its head possesses a ridged carapace, much like a Drone, with a line of spikes along the top of its cranium. Its tail has a distinct ridge of spines at the base of its harpoon-like blade. The Raven resembles an ordinary bipedal Xenomorph, but larger, almost entirely encased in a bullet-proof, chitin carapace, and only walks with its large hind legs - like a Queen.