"Birhors" are considered as one of the primitive tribal groups in India, who are beleived to be the only "Hunting and Gathering" tribes in the region of India. Economy of a group of people with primitive technology depends on ecology, enviorment and adaptation process. Author Dr. Mohua Mukherjee has created a work of art by staying with the birhors and collecting many useful informations on them and kodarma, where they lived. The tribals also took her as there own man. It covers the lifestyle and many social aspects of these primitive tribes from India's Bihar state. The book has a detailed projection of these primitive groups and there socio-economic life style.