The four characteristics of mammals are as follows:
1. Mammals are endothermic animals (warm-blooded) and are considered most evolved organisms of the animal kingdom.
2. Mammalian body can be divided into neck, trunk, head and tail.
3. Mammalian females have mammary glands which help in the production of milk.
4. Abdominal and thoracic cavities are separated by a muscular diaphragm.
Typical examples of mammals include Panthera tigris (Tiger) and Macaca (Monkey).