Scientists have discovered through the dissection of dead parasitic creatures that the body structure of the Parasitic Civilization is quite peculiar; where their heads should be, they have a circular mouth (oral apparatus) as large as their bodies, with a row of sharp triangular teeth at the edge.
These teeth are not only sharp but can also tilt outwards at a ninety-degree angle, turning into a sharp circular saw that can easily cut through the skin of most organisms.
This is also one of the key abilities for the parasitic creatures to parasitize their hosts.
The circular saw teeth were used earlier to bite open an incision on the back of a rat and the use of the parasitic creatures' sharp teeth is more frequent during the parasitism process than one might imagine.
