


It can be encountered in the playable Half-Life 2 leak in several coastline maps (such as d2_coast_02, among others), where it takes the role of the Leech, i.e. The Ichthyosaur was to appear more prominently in Half-Life 2. Strong art direction and clear goals were set for the creature from the start, but the AI proved to be very complicated due to its size and how different it was from the more common game monsters of that time. The Ichthyosaur was originally referred to as "Muddy". Underwater, he is almost swallowed by an Ichthyosaur before being teleported elsewhere. During a teleport malfunction ("harmonic reflux"), Gordon Freeman is momentarily transported outside of City 17, in midair, before falling into the ocean. The Ichthyosaur also makes a single appearance in Half-Life 2. The speed and viciousness of the Ichthyosaur combined with poor underwater visibility make the underwater areas of Half-Life some of the most frightening parts of the game. They are often placid at first, but quickly become hostile, especially should the player take action against them. In Half-Life, Ichthyosaurs are encountered in several water bodies, including a flooded laboratory, the reservoir behind a hydroelectric dam, in the sewage areas and in one of Nihilanth's chambers. When the Ichthyosaur is first encountered in the Half-Life chapter Apprehension, a scientist remarks that while he has been told it was hauled from the Challenger Deep in the Pacific Ocean, he is of the opinion that the creature never swam in terrestrial waters until a week before. In the concept art, the creature is said to use its limbs to pull itself along the murky bottom and to impale and hold prey. An Ichthyosaur has several fins a long, whip-like tail, used for locomotion and two arms that end with a single dagger-like claw. Perhaps the most characteristic feature of this dark green aquatic creature is its large head with an epoccipital bone, and a mouth with sparsely-grown sharp teeth. In Half-Life: Opposing Force, a wall poster depicts the creature's skeleton with the title "Xenotherus Icthycanthus".Īlthough it is named after the extinct marine reptile group, the Ichthyosaurs, it resembles them only in its carnivorous ecology and its general size.
