This article is from the Alien Movies FAQ, by Darryll Hobsonand Eelko de Vos E.W.C.deVos@TWI.TUDelft.NL with numerous contributions by others.
This section discusses what we know about the Alien life-form; it is
entirely based on facts that are provided to us in each of the movies.
* Note: nothing in any of the canonical sources indicates that aliens
use the DNA of their hosts to help adapt to their environment.
* Note: the phrase "acid for blood" is accepted in this section as a
convenient way of describing the corrosive liquid that comes
out of the aliens/face-huggers when they are shot/cut/mutilated.
 
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