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Half-Life Hints
What is that odd little creature that just teleported in?
1 of 5: The first alien you meet is a headcrab.
2 of 5: Headcrabs are the simplest form of alien that will do damage to you.
3 of 5: Their jaws are on their undersides, and they lunge at the head or upper body of their victims. If they kill their victim, they can assume control of their victim's body, effectively turning him into a zombie.
4 of 5: Don't worry, the ones in the test tubes cannot break free.
5 of 5: Any other headcrabs you meet will be out in the open, so beware. You will eventually learn to recognize them by the sounds they give off.
