Thar Desert natural vegetation of this dry area is classed as Northwestern thorn scrub forest occurring in small clumps scattered more or less openly. Density and size of patches increase from west to east following the increase in rainfall. The natural vegetation of the Thar Desert is composed of the following tree, shrub and herb species: The endemic floral species include "Calligonum polygonoides", "Prosopis cineraria", "Acacia nilotica", "Tamarix aphylla", "Cenchrus biflorus". The Thar Desert is the most widely populated desert in the world, with a population density of 83 people per km. In India, the inhabitants comprise Hindus, Muslims, and Sikhs. In
Thar Desert villages. During famine years in the desert the nomadic rebari people move with large herds of sheep and camel to the forested areas of south Rajasthan or nearby states like Madhya Pradesh for grazing the cattle. The importance of animal husbandry can be understood from the organization of large number of cattle fairs in the region. Cattle fairs are normally named after the folk-deities. Some of major cattle fairs held are Ramdevji cattle fair at Manasar in Nagaur district, Tejaji cattle fair at Parbatsar in Nagaur district, Baldeo cattle fair at Merta city in Nagaur district, Mallinath cattle fair at