I still prefer to think of the queen in 'Aliens' as an aberration /first of its kind/ an adaptation to environmental circumstance. Folk on the whole seem to have this need to limit the xeno to a big ant (in part fuelled by years of Dark Horse comics that followed the lead of the second movie only). But that's not what the movies show us. In fact, we've never seen the same thing twice on screen when it comes to the Alien movies. The Xenomorph works best as a volatile and chaotic adaptive creature that cannot be predicted.