Indian rats and mice can be classified into three groups according to their habitats in which they live. The first group comprises those wild species which are found in scrubs and forests and they are mostly arboreal in nature (e.g. Indian bush ratGolunda elliot, and white-tailed wood rat-Rattus blanfordi). The second group is the field rats that are common pests to crops (e.g. Mus booduga). The final group is the habitual household pests (e.g." common house rat or black rat-Rattus rattus).