Explanation:

=> Tiwa also known as Lalung is indigenous community inhabiting the states of Assam and Meghalaya and are also found in some parts of Arunachal Pradesh and Manipur.

=> They are recognized as a Scheduled tribe within the state of Assam. But they still do not benefit the ST status in the state of Meghalaya.

=> They are divided into 2 sub-groups- Hill Tiwa and Plains Tiwa which have contrasting cultural features:

• Hill Tiwa: They live in the westernmost areas of Karbi Anglong district. They speak a Tibeto-Burman language. In most cases, the husband goes to live in her wife's family settlement (matrilocality), and their children are included in their mother's clan. One-half of them follow their traditional religion. It is based on the worship of local deities. The other half has been converted to Christianity since the 1950s.
• Plains Tiwa: They live on the flatlands of the Southern bank of the Brahmaputra valley. The vast majority speak Assamese as their mother tongue. Their descent system is patrilineal. Their religion shares many elements with Assamese Hinduism but remains specific.

=> They practice Jhum or shifting cultivation, where the land is first cleared of any vegetation that is later set on fire (slash-and-burn). The result is a more fertile soil that is freshly enriched with potash, all the more useful for a bountiful crop.

=> The main festivals of the Tiwa tribes are: Three Pisu (Bihu), Borot utsav, Sogra phuja, Wanchuwa, Jonbeel Mela, Kabla, Langkhon Phuja and Yangli Phuja.

=> Pig is a staple part of their diet and their culture.