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Half-Life Hints
Where is that spitting coming from?
1 of 6: As you come upon the Lower Canal, you will hear something making spitting sounds.
2 of 6: Creep slowly so you can see into the Lower Canal and you will see some strange alien attacking some headcrabs.
3 of 6: The alien is called a bullchicken. It basically attacks an enemy with a large green glob of what's presumably mucus. It can also charge and attack in close combat as well.
4 of 6: Try not to be noticed until the bullchicken has disposed of all of the headcrabs. That way, you will not have to deal with them. If you are noticed, the bullchicken will abandon the headcrabs and go after you.
5 of 6: When you are noticed by the animal, avoid the largest green glob. That is the one that will do damage. The others will not.