User blog comment:Supahbadmarine/Andromeda Xeno Lab/@comment-2253300-20110621045846

The Tyranids will be playing a part in the Andromeda story. As they are extragalactic to begin with, it is perfectly logical to believe that the Milky Way galaxy is not the only place that is currently under attack by these monstrous organisms. The Tyranids are attacking here too. there were some suggestions that I make Andromeda the Tyranid galaxy of origin, but I felt that whatever galaxy the Tyranids originally came from is probably a barren lifeless place, and if I were to do this I would have to create explanations about some of the mysteries of the Tyranids which may or may not be true. While the Hive Fleets of Andromeda have many similar characteristics to the ones in the Milky Way, they also have many differences. Having sampled the genetics of a very different series of species, the Hive Fleets of Andromeda will have Tyranid species and Bio-morphs not found in the Tyranids of the Milky Way, and Vice-Versa.