The potential Queen Facehugger also impregnated a dog (Or as shown in the special edition an ox) before dying and being discovered by one of the prisoners, leading to the Runner Xenomorph. It should be noted that when the Runner discovered Ripley, it did not attack, sensing the Queen inside of her. It is not known if a Xenomorph will refuse to attack an individual infected with an ordinary xenomorph, or just a Queen.