User blog comment:Garfield 123/What Alien Species From Metroid Would Be the Largest Threat to Mankind in Today's World?/@comment-1960283-20101020055403

Well, the X are known to sometimes turn their hosts into doing things against their will (like the ing). Remember those normal hornoads in Fusion in the background and they start attacking you when infected?

About the Ing's reproducing capabilities, I don't think they are anywhere near as fast as the X's. If that was the case, the Luminoth would not have held out during the war for as long as they did, which, if im not mistaken, is between 10 to 20 years.