So with what your saying is that the Aliens were created as Human-Like from the 1st movie? Is this because the facehugger planted itself onto the guy (can't remember his name) that found the eggs in the stasis chamber onboard the Space Jockey Ship. If this is the case, then what REALLY do the ALIENS look like! What is their 1st design?
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Well, there basic features would remain constant, you know inner jaw, acid for blood, the tubing..etc. But the host determines relative size, whether its bidpedal or quadripedal as well as additional features that help it to adapt to its environment.(if the host uses those traits, its assumed that it is in the environment of the host, therefore it will be beneficial to the alien as well, regardless if it merely bursts out of a creature that is currently not in its natural envrionment, hence the predalien receiving the mandibles..etc.
Facehuggers and the eggs are pure with not host dna. The queen would have the crown and little arms and big tail, but its facial structure and teeth and relative size would vary depending upon the host.
The aliens are adaptable as f**k. The original form would only exist provided they evolved on a homeworld and only there would you find the intended hosts it adapted to impregnate etc.
If they are a creation of the spacejockeys, then perhaps they are a genetic chimera of species, with the most deadliest traits taken and never had a regular form independent of its host.
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So then - is it possible that the Space Jockeys are the creators of the alien race? you also mention that the host determines relative size, whether its bidpedal or quadripedal as well as additional features...............
What would happen if (and only IF) a facehugger was to attack a creature such as the large centipede which has hundreds of legs. It has been documented that some species of centipede grow to larger than normal proportions. Lets just say that it happened.....what do you think the result would be of the Alien?