if you know the demon 's species ( or name , in the case of a greater demon ) , report it ; if you do n't know the demon 's species , remember possible identifying features such as : skin color ( gray , green , purple-black , iridescent ) and texture ( scales , hide , bony spikes , fur ) presence of slime , color of slime number of eyes , mouths , noses , arms , legs , heads size ( compare to other things of similar size rather than trying to estimate actual measurement-e.g. , `` about as big as a grizzly bear '' ) noises ( languages spoken , high-pitched voice versus low-pitched voice ) gender markings ( very rare except with greater demons ) noticeable strengths ( eats rocks or metal , ability to cling to walls and ceilings , etc . )