(Note: I do not own the rights to either Alien or Predator. Both are owned by 20th Century Fox. Please do not sue.)
From the Desk of Colonel Niemman Subject:
The Social Structure of the Hive on Jupiter II
The Hive of Xenomorph Aliens on Jupiter II was quite different from most hives. This social structure began with a lone soldier, an escapee of the planet LV-426. This fertile soldier somehow impregnated a female member of another species (an action previously thought impossible), forcing that creature to be its queen. This queen laid eggs (an action yet to be explained) of the Xenomorph breed. The ship transporting this couple crashed on Jupiter II. This crash was reported on the outskirts of the Colony Pikesville. The Colony was soon overrun with the Xenomorph breed, and a local zoo carrying Terrestrial creatures gave birth to many special "troops." For over three decades this growth went unchecked and, by this time, the soldier had begun reproduction with one of his offspring. Because of this power exchange, the Soldier began growing in size as an expression of his dominion. He also developed a regal crest around his cranium. He is number one in the hive, his queen is number two. I will update this report with any more information gained.