Headcrabs

Headcrabs are alien parasitoids, roughly the size of a pumpkin. They are covered in smooth skin that varies in color between subspecies, and walk on four legs comparable to those of a spider. The shape and length of these legs relative to the mass of the body varies between Headcrab subspecies. Headcrabs are capable of leaping up to 3 meters (10 feet) in any direction, but will only perform this leap as an attack, and require a direct line of visual contact to their target before they will do so. If they miss their target when leaping, Headcrabs are placed in a disadvantageous position, as it must turn completely around at a very slow speed before attempting another. Their average weight is around eight and a half pounds, as indicated by the payload discrepancy of the rocket launched in Half-Life 2: Episode Two, where Lamarr can be seen sleeping in it before the launch. Their underbelly is almost entirely covered by a large, jawless mouth, with a hidden 'beak' used for feeding and for