Clarification/Follow-up by denberg on 01/21/05 11:26 pm:
Jim that's an excellent answer, thanks. In case you're wondering where I heard the term, it was in the novel THE MIDWICH CUCKOOS by John Wyndham...ever heard of it?

Thanks again,

Paul.

Clarification/Follow-up by Jim.McGinness on 01/23/05 9:26 am:
I know of John Windham and I think I've read one or two of his books -- but I remember him more for the movies that were made from a couple of those books. Looking back, the movies were pretty bad, but they were scary enough for me when I saw them.

Clarification/Follow-up by peddler7118 on 08/28/06 12:52 pm:
http://www.answers.com/topic/xenogenesis

It is a cool sounding term for Barney giving birth to the Road runner.

See Hopeful MonsterTheory:
evolution-facts.org/Ev-V3/3evlch29b.htm