The fact about rats is that they are everywhere and not easy to control unless you are a professional. Specifications for rats can vary. The length of an average rat is from 6-18 inches that's including their tail. Roof rats tend to be charcoal gray in color as compared to your sewer rat which is a brownish tan. Their diet consists of eating almost everything, its not much of a diet. They consume ½ to 2oz of liquid a day. These are nocturnal creatures they eat and drink under the cover of darkness. They are loud and gnaw at anything they can, rats have been known to cause electrical fires in homes by exposed electrical wires in attics. Rats are the cause of much damage and carriers of parasites and diseases.