Rats have a large, robust body weighing from 7 oz to 18 oz. Their bodies can grow 7-9.5 inches in length with tails growing 6-8 inches. They have short ears and small eyes. Rats vary from brown to black in color and are also color blind with poor vision, however, they have an excellent sense of smell, taste, touch and hearing. Rats can enter the home in multiple ways, usually from underground. They can enter through openings 1/2 inch or larger.