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The Facehugger
Once released from the egg, the facehugger uses its tail to propel from the egg and attach itself
to the host by use of its tail and fingers as shown on the picture to the right.
When attached to the face of the host, it tightens its hold around the neck of the victim thereby rendering him (or her) unconscious due to lack of air. It then subsequently attaches its fingers around the head, whereafter it forces a long tube down the throat of the victim, in order to be able to feed him oxygen, keep him unconscious and most important, plant the embryo inside him (or her). It would seem, that the facehugger doesn't need any oxygen itself (or any other atmosphere for that matter) since Dallas and Lambert were able to transport Kane all the way back to the Nostromo, and according to the script, that's 3000 meters in an atmosphere made of nothing more than 10% agron, 85% nitrogen and 5% neon. So the facehugger must be able to convert the atmosphere to that of the victim, or else Kane would most likely have been dead.
The facehugger has no visible sensory units, but it is speculated through the books that the facehugger senses only by hearing, and that it has no visual sensory. This seems a bit unlikely though, because it has to somehow know where the head of the victim is, and unless it has some sort of sonar capabilities with which it can create a picture of the surroundings, this is probably not the case.
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