There's a difference between lab mutalids and wild mutalids:
Lab Mutalids:
Easily noticeable due to their pale white complexion. This is because they don't have scales. Lab Mutalids have been artificially bred in tubes, and at time of the outbreak they hadn't fully matured leading to their underdeveloped bodies. They don't feature large blade-like appendages or the ability to produce the nest-creating slime, unlike their wild counterparts. They also seem far less intelligent, and lack the obvious social structure of wild Mutalids. Lab Mutalids can be taken down with concentrated arms fire. Small arms fire can kill a Mutalid, but is extremely ineffective. While not as dangerous as their wild counterparts, lab Mutalids are still an extreme threat to the survivors.
Wild Mutalids:
These are the original Mutalids. The origin of these creatures isn't exactly known, and is surrounded with theories and rumors. Wild Mutalids are often fully matured, sporting an almost impenetrable layer of scales over a thick, dry skin. Wild Mutalids can be easily distinguished from their lab counterparts by observing their colour and size. Wild Mutalids are often much stronger, and due to this have a larger build. The coloured scales over their pale white skin represents the creature's gender where lighter, more green shades are female and darker, red shades are male. Wild Mutalids appear to have a social structure and gender roles, where the female remains at or near the nest while the male leaves for long periods of time for hunting. The male is often much more aggressive, whereas the female is quite passive; if not extremely territorial and protective of her eggs. Wild Mutalids seem almost indestructible. While they can feel pain, there is no confirmed quick method to kill them.
Poll