Water helps animals to digest their food. Water regulates the body temperature of animals. Animals also use water to clean their body. A mammal is an animal that breathes air, has a backbone, and grows hair at some point during its life. In addition, all female mammals have glands that can produce milk. Mammals are among the most intelligent of all living creatures. Mammals include a wide variety of animals, from cats to humans to whales. mammals are grouped based on their reproduction, anatomy and habitats. Mammalia has the largest class in the animal kingdom Based on the reproduction, they are classified into three subclass- Eutheria, Metatheria, Prototheria. The studies were carried out for a period of winter season ( 15 Nov. To 15 Feb.).