Once successful, the Headcrab takes control of the host's nervous system and causes physical alterations to the host's body, such as causing its hands to deteriorate into bony 'claws', via an unknown biological process. Using its leaping ability, it can reach a host's head and attempt to burrow its beak through the skull. However, the Headcrab's main goal is not to kill, but to attach itself onto an appropriate host's head. Although it can quickly leap long distances using its hind legs, tilting its body upwards to turn its mouth towards its target, such an assault can only inflict minor injuries with the claws, legs and teeth. The Headcrab can appear harmless at a glance: it is small and slow-moving with its tiptoe-like gait. While walking, a Headcrab can be seen lifting its larger claws upward, leaving two of its stubby legs to provide frontal support. Baby Headcrabs look similar to baby scorpions, being very tiny creatures with soft, translucent white bodies. Underdeveloped "baby" Headcrabs spawn at a rapid rate from a sac that dangles beneath the creature. In Half-Life, Headcrabs are found to have originated from a giant creature known as a Gonarch which shares similar physical qualities with Headcrabs. When attacking, Headcrabs emit a sharp, shrill shriek as they leap towards their victims. When they are not hunting, Headcrabs usually emit squeaks and fairly quiet, repetitive calls while gently swaying their bodies back and forth. Headcrabs can produce a variety of vocalizations. A Headcrab may weigh up to eight and a half pounds, although this is the weight of Lamarr, a well-fed Headcrab. Under the body is a round, lipless mouth containing a sharp "beak" used to burrow through the host's skull.
Four "mouthparts" can be seen on their front that end in sharp fangs, possibly used to either hang onto a host or inject them with a sedative or some other chemical used in the zombification process. Despite their small size, the Headcrab's back legs can support its entire body, allowing it to "tiptoe" across the ground and leap several feet into the air at its prey. They have round, smooth, tan-colored bodies and four legs, two long clawed ones on the front and two thick, stubby ones in the back.
Headcrabs are fairly small creatures, about two feet long from front leg to back and a foot wide.
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