Antlions:
The Antlion is a voracious insectoid creature of several differing castes, with a hierarchy very similar to that of ants. Antlions are social creatures living in large underground colonies. They are blind and use pheromones and vibrations to identify other living beings. They come in several types, some of which are separate castes.
Antlion Soldiers:
The Antlion Soldier is a four legged creature around 3 to 5 feet in height and 6 feet from head to tail. Their legs are arranged oddly, with their back legs set at their front, and vice versa. Their hard shells are mostly green with stripes of tan, yellow, purple and red. They have no visible eyes, and have three mouthparts arranged in a triangle on their face. Hidden beneath the Antlions' shells are wings which allow it to fly several feet in the air, making a loud buzzing noise as they take to the air. They are also quite powerful burrowers, able to tunnel through solid rock and even concrete. Antlion Soldiers are charged with gathering food for their nests, using their keen senses of touch and smell to track their prey. Once they pinpoint a potential meal, they swarm the target relentlessly, biting and headbutting their prey until dead, after which they return to their nests with their kill to feed their hungry brood.
Antlion Workers:
The Antlion Worker or Acid-lion is a type of Antlion, only found in or near Antlion nests in which they perform various tasks including the tending of Antlion Grubs. They produce a corrosive acid (which is also a neurotoxin) which they use to create tunnels for the nest and also to ward off attackers.
Antlion Guards:
The Antlion Guard is much larger and stronger than the Antlion Soldier, and is a very formidable foe. Within the Antlion society, the Guards defend the Antlion nests' outer perimeter and entrances, and they control and keep order within the Antlion colony. Antlion Guards resemble a considerably larger and more powerful Antlion, with a similar skin color and insectoid features. The most differentiating feature, by far, is the Guard's protected carapace, which acts as both a battering ram and a deadly weapon. Their dark-red tint and radiant blue "feathers" which adorn its back make it clearly distinguishable.
Antlion Queen:
Not much is known about this type of antlion, except that it is the leader of the hive and also gives birth to all the antlions.
Headcrabs:
Headcrabs are fairly small creatures, roughly the size of a pumpkin, which crawl on four legs, and have enough jumping power to leap up to 10 feet (3 meters) in any direction. Their underbelly is almost completely covered by a large, lipless mouth with a hidden "beak" used for feeding and latching onto the skulls of victim. They are capable of jumping onto the head of an unsuspecting victim, and penetrating a beak of sorts to take control of the hosts nervous system. They are the national animal of BorderWorlds.
"Normal Headcrab":
Headcrabs are fairly small creatures, about two feet long from front leg to back and a foot wide. 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. 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. 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. Under the body is a round, lipless mouth containing a sharp "beak" used to burrow through the host's skull. A Headcrab may weigh up to eight and a half pounds, although this is the weight of Lamarr, a well-fed Headcrab.
Headcrabs can produce a variety of vocalizations. When they are not hunting, Headcrabs usually emit squeaks and fairly quiet, repetitive calls while gently swaying their bodies back and forth. When attacking, Headcrabs emit a sharp, shrill shriek as they leap towards their victims.
"Fast Headcrab":
The Fast Headcrab looks much slimmer and more agile than a normal Headcrab, having thinner, spindly legs; smoother, lighter bodies and no visible mouthparts. Fast Headcrabs share many of the vocalisations of the standard Headcrab. Examined up close, Fast Headcrabs have wart-like bumps on their skin. The legs of a Fast Headcrab also have elongated claws, which as well as serving as weapons and a means to latch on to surfaces, waiting to attack unsuspecting prey.
"Poison Headcrab"
The Poison Headcrab can be identified by its dark skin (sometimes with a wet sheen) and thick hairs on the joints of its inward-bending, spider-like legs. On the Poison Headcrab's legs are white bands that encircle the knee joints and the creature's dorsal markings are similar to those of a species of orb-weaving spider (Araneus diadematus).At walking pace, the Poison Headcrab is the slowest Headcrab, but panics and runs away if attacked. Poison Headcrabs move slowly and cautiously when maneuvering but leaps with incredible speed while releasing an angry squeal when a suitable host is in a clear line of sight. As an ambush tactic, it leaps at and poisons a viable host in an attempt to create a Poison Zombie. Poison Headcrabs make a sound similar to Rattlesnakes when searching for prey. Also, as another lure, the Poison Headcrab will make a whistling noise. This variation of the headcrab get's it's name from the deadly neurotoxin it uses to paralyze it's victims.
