The host appears to retain partial consciousness once the Headcrab has taken control, as Classic Zombies and Zombines retain a certain ability to talk.Įach Headcrab variation affects its host in its own way, producing a Zombie extremely distinct from the other types in both appearance and behavior.Ĭlassic Headcrabs emerging from a deployed Headcrab Shell. Therefore, it is very likely that they can host Xen creatures as well, such as Vortigaunts. As no humans live in Xen, the headcrab's homeworld, it would seem unlikely that they would evolve such abilities if there were no hosts. As seen in Station 6 in Half-Life 2, it seems to take from several seconds to minutes for a Headcrab to turn humans into Zombies. After breaking through the skull, the Headcrab proceeds to take over its host's motor functions through some unknown biological process, keeping their host alive but helpless through the entire process. Headcrabs are a parasitic species, attaching to the host's head and clamping onto their skull using their sharp beak.
The Reviver - a fast and agile Headcrab that, aside from being able to shoot electric balls, has the ability to electrically reanimate dead bodies, turning its host into a Revived Zombie. However, if the glowing heart on its underside gets shot, it will break apart instantly. The Armored Headcrab - a more fragile Headcrab that carries a hardened shell capable of protecting it even from gunfire. Also introduced in Half-Life 2, it turns its host into a Poison Zombie. The Poison Headcrab - a toxic Headcrab, causing more damage to the host. The Fast Headcrab - introduced in Half-Life 2, and much faster than Classic Headcrabs. The Gonarch - a much larger, mature Headcrab species which spawns baby Headcrabs. It turns its host into a Classic Zombie, and in some cases a Gonome. 
The Classic Headcrab - the first Headcrab introduced in Half-Life, seen in its infant form near the end of the game. The Headcrab comes in several known variations: The former can be seen being prepared by Vortigaunts in Black Mesa East while the latter can be seen being roasted by the All-Knowing Vortigaunt. It appears that the flesh of both Standard and Fast Headcrabs is edible, at least for Vortigaunts. Headcrabs can, apparently, be domesticated, as shown by Lamarr, Isaac Kleiner's pet Headcrab, who has been "de-beaked", and is said to be "completely harmless." Thus, removing the beak of Headcrabs renders them unable to perform their normal function of taking over humans, rendering them harmless and apparently less aggressive.
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