Experiments with recombinant strains of FEV at the West Tek research centers produced numerous failed mutations, with two exceptions. The first of these was FEVS-006443 from October 14, 2077, a Phase 2 combination strain that combined traits that resembled a number of different species. The results were considered disturbing by the scientists but provided valuable insights as to the capability of recombinant FEV. Notable changes included a number of ocular organs along the enlarged upper torso, a second set of arms ending in clawed digits, and a large sickle-shaped claw on each inner toe. The living, stable, and functioning subject was sustaining itself normally (a major accomplishment for the program) and was planned for release in Huntersville after the subsequent experiment matured. The mutant was never returned to the area until January 3, 2078, when it escaped containment and the facility. The mutant procreated, leading to the emergence of snallygaster mutants across the Wasteland 

Biology

The snallygaster is a quadrupedal creature. It has two arms with three claws each, of which one is an opposable thumb, and two small limbs on the back of its body, which it usually uses to support itself while sitting. It has no proper face but has a mouth with a long tentacle-like tongue covered in acid and has multiple eyes along its back. A snallygaster will use its tongue like a whip up close and spitballs of acid at a range. The snallygaster has at least 40 eyes, two rows of teeth and thorns on its back. It has been described as being "a dragon-like demon that haunts an area outside of Huntersville." They are easily recognizable from a distance, due to their signature clicking sounds and the thick, pungent odor they emit.