It is possible to identify animals based solely on their droppings, or scat. The Internet Center for Wildlife Damage Management offers a page on scat identification with an easy-to-follow flow chart system for identifying the origin of the scat in question.
The Internet Center for Wildlife Damage Management first and foremost urges individuals to be safe when attempting to identify scat, as it is potentially hazardous. The page on scat identification includes pictures and information on four different types of scat. These are pellets, plop, tubular and white. The section for each different type of scat includes pictures of variations of the type of scat based on the organism that created it, along with size, shape, texture and composition information.