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.