It's also been claimed that after a hive grows to around 2,000 members, the younger Queens set out to establish new hives, and that if the Empress is destroyed, it would cause the younger Queens to fight over the new hive ruler. It's most likely that an "Empress" Xenomorph is merely a Queen that has dominated the other Queens in a hive. This would make the title "Empress" just that: a title. Despite not possessing an inner jaw, the Newborn executes a Headbite on Dr. Gediman in Alien Resurrection — by literally biting a large chunk out of his head. Another type of Xenomorph was encountered on an expedition to Antarctica. These Warriors were less humanoid and sometimes walked on all fours. Their tails were longer, with a large, curved barb at the end. The head was smooth but much shorter than normal. It is important to note, however, that this particular Xenomorph hive was grown by the Predators, who introduced a hormone with unknown effects into the Queen's system. Here we have a Sigorny Weaver in her natural habitat engaging in some napalm-assisted negotiations with a proud xenomorph mother. Evolution of the eye

Richard Meyers. The Officially Authorized Magazine of the Movie Alien, p. 5 ( 1979), Warren Publishing. Dan O'Bannon, meanwhile, envisioned the Alien as being part of a higher culture, and the only reason the individual aboard the Nostromo is so hostile is because it finds itself alone and ignorant. [17]

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In Alien³, a fish-eye lens represented the Runner's sight, but it is unknown if this is really how it sees or simply a filmed representation of the creatures' sensory perception. Like normal Xenomorphs, a Predalien gains traits from its host. From the chestburster stage, it is noticeably different from other Xenomorphs. It is a somewhat dark shade of green with external mandibles, due to its Predator (Yautja) heritage. Bodyburster: A rare neotenic Xenomorph that never matures past the chestburster stage, resulting in a giant worm-like creature.

Some Xenomorphs have six fingers, with the index and middle fingers conjoined into one digit, ring and little fingers also conjoined, and thumbs on both sides. The "Runner", a Xenomorph born from a dog or other quadrupedal host, is notable in that it doesn't have dorsal spines. This could be an adaptation to make its body more aerodynamic and thus more efficient for running. On at least one occasion, Human-spawned Xenomorphs were observed to have a digitigrade, as opposed to plantigrade posture. However, it should be noted that these were spawned by a Queen grown from cells derived from a clone of Ellen Ripley, making their genetic heritage muddled at best. It is somewhat unlikely that this fluid carries oxygen for a few reasons: the first being that the Xenomorph has been known to survive in vacuums such as space (for short periods of time, at least). The second being that Bishop mentions that the fluid loses its acidity shortly after the creature's death due to oxidation [10]. On the other hand, this is plausibly unimportant as oxidation is a term in chemistry used for the loss of electrons rather than a reaction with oxygen. All acids are oxidized no matter what they react with, therefore this has no bearing on blood carrying oxygen. The xenomorph entry at aliens.wikia discusses possible theories for the senses (including vision) of the xenomorphs. Echolocation and some form of vision (through the carapace) both get mentioned, indeed.

Evolution of the eye

In the year 2122, while transporting an ore refinery from Thedus, the Nostromo, a commercial towing vehicle, was redirected to LV-426, supposedly in response to detecting the distress signal emanating from the planetoid; in reality, Weyland-Yutani had pre-selected the Nostromo to investigate after detecting the signal themselves, placing a Synthetic sleeper agent aboard to ensure the survival of anything that was discovered. Within its franchise, the Xenomorph has been referred to as "Kane's son", a "creature", a "serpent", a "beast", a "dragon", a "monster", a "nasty", a "thing", a "bug", among others. The Yautja-spawned Xenomorph (a.k.a. "Predalien") has the ability to use its inner mouth to implant chestburster embryos directly into a host's throat, like a facehugger. Since that particular Predalien was also on her way to developing into a Queen, it's possible that all future-Queens have this ability.