transport will either climb on top of the controlling headcrab and jumps at the player or is thrown by the host at the player. (It is also possible that these additional headcrabs are produced by the host human as a method of reproduction on the part of the primary headcrab). Headcrab zombie In-universe, a headcrab's primary goal is to attach to the head of a suitable host using its mouth (typically covering the face and most of the head). The headcrab then burrows its claws and hind legs into the host and opens up portions of the skull with its mouth, incorporating parts of its biological workings with the motor cortex of the host's nervous system. The victim is thus taken over by the headcrab and mutated into a zombie-like being known as a headcrab zombie, referred to as a "necrotic" by the Combine Overwatch. Once the headcrab has converted a host into a zombie, the torso of the host is open and organs can be seen. In the first Half-Life, the player can see the texture of the host's skull on the headcrab. However, this was removed in future installments. They are slow-moving but powerful, using their claws to beat their victims to death. They moan almost constantly and growl when they detect prey. In Half-Life 2, they swat loose objects when they run into them, creating potentially lethal projectiles. Half-Life 2 also introduced still-moving zombies which are severed at the waist and crawl toward the player using their arms. Host bodies are catatonic immediately after infestation, and after a while rise to attack. There are many varations of the headcrab zombie, some are faster, armored, or infected Combine soldiers. These have multiple differences between each other and the normal headcrab zombie. Fast and poison headcrab zombies are created when the respective headcrab attaches itself to a host. A Gonome is unique in that it is a more aggressive and armored mutation of a standard zombie. The "Zombine" is created when a headcrab zombie is created from Combine soldiers. Alyx Vance coins the term "Zombine" for them as a portmanteau of "zombie" and "Combine". The introduction of the Zombine was meant to indicate that, in the wake of the devastation caused by the player in Half-Life 2, what was once a valuable weapon in the Combine arsenal is now just as dangerous to them as it is to regular