(November 7, 2008 at 9:22 am)Kyuuketsuki Wrote: ... I'm simply saying that things like 3 legged aliens might not occur because of evolution and sound engineering principles for the same reason that Laver's demonstrates how King Kong and Godzilla are complete crap (from an engineering standpoint). A tripetal (is that right?) life form might evolve but (and I'm guessing here) might not be very efficient.No reason at all why there couldn't be tripedal aliens. Just because it doesn't make sense engineering-wise (blind spots, breathing/eating through the same orifice etc), doesn't mean it couldn't evolve into a solution to an environmental problem. As long as it does the job and gives even a tiny advantage over the competition it'll be used.
There is no one solution for walking about, see all the various forms available on the Earth!