There are two kinds of facehuggers that correspond to two kinds of aliens-purebreeds and transbreeds. The eggs hatch into facehuggers who can latch onto other creatures and impregnate them with an egg that will eventually become a fully grown alien. The aliens' method of building revolves around a Alien queen, which can deliver attacks and also remains in the hive to lay eggs. The predator units are all combat-oriented, and they have a number of special abilities like cloaking and self-healing that use up slowly regenerating energy points. They can be called in at any time and simply land on the planet from space. The more honor the player has, naturally, the more predators will want to join the clan. As the player kill enemies, he can rip the skulls from their corpses in honor of the hunt. The predators have a straightforward resource model that's effectively based on honor. The Colonial Marines also have three support units, one for healing and a synthetic which can deploy gun turrets and has a motion detector for picking up offscreen movement, the third unit, the commtech is the basic support unit, whose job it is to call for extra troops and repair atmosphere generators. There are a diverse number of marine combat units, including pulse rifle-equipped infantry, flamethrower troopers, and smartgunners. The colonial marines gain credits by killing enemies and repairing atmosphere generators, and these credits can be put toward upgrading troop abilities and calling in new units via dropships that stop at nearby landing beacons. Each race has a distinct method of obtaining new troops. The game is strictly focused on unit management and combat. Unlike as in the most other Real-time strategy games in Aliens Versus Predator: Extinction the player(s) don't have to do any building and base construction. 2 Differences between the PS2 and Xbox Versions.

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