The roof rat has soft, smooth brown and black fur with a white, gray, or black belly. They have a pointed muzzle, large eyes and ears, and a long, scaly tail. Infestation signs are the same as other rodents. They have poor vision but keenly developed senses of hearing, smell, touch, and taste. They are fairly cautions about new objects although they are constantly exploring their surroundings. In structures, roof rats prefer to nest in the upper parts of the building, but may occasionally be found in basements and sewers. Outdoors, they prefer nesting in trees, but burrows are sometimes found in vegetation around buildings. Roof rats also carry a number of diseases.