User blog:Blueyhale/The Tyranids; devouring or running from something?

Tyranids being the biggest threat to the Imperium and other xenos in the milky way galaxy then the question is; could they be running from someone?

Tyranids may be the only known aliens to come from another galaxy but there is a another xenos that is a bane to all races; the green skins and I read sources and it is quite possible they inhabitate other galaxies (just like the nightmarish creatures of c***** censored by the Inquisition).

So could the tyranids be running from or were driven out by the greenskins in that galaxy that they share?