The Indian grey mongoose or common grey mongoose are mainly found in southern Asia, in India, Pakistan, Nepal, Sri Lanka and some other parts of Asia. Usually found singly or in pairs.

The grey mongoose is commonly found in open forests, scrublands and cultivated fields, often close to human habitation. In NEERI Campus they are observed solitary as well as in pair. It lives in burrows, hedgerows and thickets, among groves of trees, taking shelter under rocks or bushes and even in drains. They are very bold and inquisitive but wary, seldom venturing far from cover. It can climb very well.

The Indian grey mongoose or common grey mongoose is medium sized tawny or yellowish grey with a lighter underside, darker feet, and dark red tail tip. They have a reddish tint to their heads. Their tail length equals their body length. Body length is of 36-45 cm. Males are significantly larger than the females.

Being carnivorous it feeds on many species ranging from rats to snakes. It breeds throughout the year. Mongooses have an anal sac used in communication. Males spray only during the mating season. They reproduce rapidly, with females giving birth to two or three litters per year. Litters typically contain 2 to 4 young. The gestation period is 60 to 65 days with parturition occurring in May or June and October to December.

Mongoose can see colours, unlike most mammals, which have only partial colour vision.