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A headcrab is a small monster from the Half-Life series. They are one of the most common hostile NPCs, and due to their relatively low health may be considered one of the easier opponents. Headcrabs attack by lunging at and biting the player.
Zombies are former humans who now host a headcrab attached to the facial region. Sometimes when a zombie is killed, the headcrab will detach from the face and attack the player.
- monster_headcrab - the original Half-Life headcrab.
- npc_headcrab - the typical headcrab, functionaly identical to the headcrabs from the first Half-Life.
- npc_headcrab_fast - slender headcrabs which move more quickly than their counterparts. Creates the fast zombie.
- npc_headcrab_black - black headcrabs are poisonous, and their attack will temporarily reduce the player's health to 1. May be carried by a poison zombie.