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However, to counter their strength as a deadly parasite, their undersides have been made vulnerable as compared to other forms of Headcrab species. Their backs are covered with thick armors, protecting them from enemy attacks.
The Armored Headcrabs: Armored Headcrabs are called so because of their strong backs. This Headcrab species was also introduced in Half-Life 2 and is considered, to date, the most dangerous form of Headcrab species ever created. As soon as they attack their victims, the poison gets injected in them and they transform into Poison Zombies. The Poison Headcrab: As their name suggests, Poison Headcrabs contain poison in their bodies. Since they affect the host’s motor skills too while they change them, their victims become really fast in terms of their walking and attacking speed. The Fast Headcrabs are capable of creating zombies out of their hosts very fast. Just like their name depicts, their specialty is their speed. The Fast Headcrab: The Fast Headcrab appears in the second installment of the Half-Life game series, Half-Life 2. They have the ability to change their humanoid hosts into Gnomes which are also referred to as Standard Zombies. They appear in Half-Life I at the end of the game. The Standard Headcrab: The Standard Headcrabs are basically Headcrabs in their most infant form. These include the Standard Headcrab, the Fast Headcrab, the Poison Headcrab, and the Armored Headcrab. There are four types of Headcrabs introduced in the Half-Life game series.
Once the victim has been clearly turned into a zombie, they look like a walking dead form of a Headcrab which is able to communicate through their zombie cries. The whole process results in visible body changes such as elongated nails, rotten skin, and deformed hands and feet, thus changing a subject into a zombie. Throughout this process, Headcrabs keep themselves attached to the victim’s head unless finally, they become ‘one’ entity. They do so by secreting such chemicals into their victims’ bodies which not only mutate their reflexes and hampers them from moving but also cause damage to brain chemistry. Headcrabs have the ability to control their prey’s nervous system and by doing that, they completely rip off their victims from any ability to resist. They cling on to the prey’s skull and break into it with the help of their beaks.
Headcrabs attack their targets, humanoid hosts usually, by landing on their face.