Facehugger

A Facehugger is the initial form of the Alien Zenomorph creatures from the Alien movies and Games.

When a facehugger emerges from an egg laid by a queen, it's goal is similar to a Headcrab but more parasitic. Once a facehugger facehugs a host, it inserts an alien foetus into the stomach through a mouthpiece extended from the facehugger. It then acts as a parasite. Later, the alien emerges from the chest as a chestburster, thus killing the host. The chestburster is very weak, but it hides and eats, eventually becoming a Drone, Runner or Predalien (Adult forms of the Alien). They eventually become a queen which lays more eggs. The queen is also guarded by Warrior aliens, made by the Superfacehugger.