There are many reasons why the grey squirrel has been so successful in its new habitat. Most obvious to the casual observer is its greater firepower; grey squirrels carry an AK-47 sub-machine gun as standard issue, while red squirrels carry only the old-fashioned Colt.45 six-shooter pistol. In addition, the grey squirrel's 20-mile teleportation range is far more tactically advantageous than the red squirrel's mere eight metres. Perhaps the grey squirrel's greatest advantage, though, is its ability to speak eleven different languages, combined with an advanced telecommunications infrastructure which enables it to share intelligence reports quickly and efficiently.
In this way, the grey squirrel is gradually taking over the world. May Thor preserve us from this terrible fate.