Okay, kids. Auntie Joystiq is going to tell you where baby Xenomorphs come from. You see, when a Lovecraftian horror from the stars and a human face love each other very much, they produce a hideous worm-larvae that erupts from the human's chest after devouring several of his or her important internal organs. If the monster is very lucky, it will become a Queen, which will eventually connect her hulking frame to an ovipositor. This gooey, slimy appendage will plop out eggs, which will begin the cycle anew by creating a new face-hugging creature.