Write short notes about the map of origin of the bodo tribe of Assam

It is an ethnic and linguistic aboriginal group of the Brahmaputra valley in the northeast part of India.
In sixth schedule of the Indian constitution they have been recognised as plan tribals.
In many parts till now they are known as Mech which has been their historical name also.
They belong to  Indo-Mongoloid origin of Tibeto-Burman language family.
Many scholars have written their origin as the migrants of Chinese origin.
The date of their origin is not very clear yet.