Lurker

The Lurker is one of the first bio-weapons created from James Marcus' early experiments with the Progenitor Virus along with the Eliminators and Plague Crawlers. It was an amphibian that has grown to large proportions. Its eyes had devolved greatly from the mutation, but this was compensated with improved hearing senses and a strong body that was almost impervious to bullets, yet significantly weak to knifing attacks. They attacked with sharp piercing tongues and could swallow a human body whole.

However the mutation showed no increase in intelligence and research on them was abandoned, since their main trait, randomly attacking all moving objects, was of little interest to the advance of B.O.W.s. They were also very easily scared off and a single bullet was all that was needed to drive them back into the water.

Research onto Frog-based B.O.W.s would later continue on in the form of the Hunter γ, with similarly disastrous results.