xenomorphs is an alien life form that uses a host to breed. their are many stages in a xenomorphs life cycle. the first stage is the egg, the egg is a dark shade of green and is leathery, when there is movment near the egg the egg opens up and releases a facehugger. the face hugger clings to the nearest life form and shoots a tube down the hosts throat and implants the alein embreyo. the facehugger then dies and falls off the host. a few hours later the developed alien burst out of the host chest in the form of a chest burster. the chest burster will shed many times and develoup into an adult alien. some aliens will develope into queen aliens which lay the eggs.
adult alien