Cunicular Gootraxians capable of producing a similarly suffocating, albeit different gas to the one formerly inside the rooms with gas canisters, Toxic Rabbits frequent the facility's support cave where the enclosed space makes escape for unsuspecting humans nigh-impossible.
The chemical they emit is differentiated from the gas once in the area with the canisters as it has been determined to be dense chlorine gas, leaving any who inhale it feeling an intense and painful burning sensation in them