Just your average video of Anderson Silva wrestling with Amazon Indians

The video above comes from 2012 when Anderson Silva was on top of the MMA world. At the time he was considered by many to be the best fighter in the world. 

From BJJEE.com:

Appearing on the Brazilian network TV Globo’s Esporte Espetacular, Silva visited the Kamayurá Tribe in the Brazilian state of Mato Grosso, north of the Xingu River, to train and learn their tribal style of wrestling, the Huka Hukua.

Huka-huka is a Brazilian folk wrestling style of the indigenous people of Xingu, in the state of Mato Grosso. It is performed as a ritual fight during the ceremony of Kuarup.

Rules
Huka-huka starts with the athletes on their knees. It begins when the owner of the fight, a male chief, walks to the center of the arena and calls his opponents by name. The fighters kneel rotating clockwise in a circle facing the opponent, until they look at each other and cling, trying to lift the opponent and knock him to the ground. The fight is performed by either men and women.

Huka huka as a martial art
Huka huka is being introduced, experimentally, in the formation of São Paulo State Military Police. The fight is also being studied by mixed martial arts practitioners.

In the video, you can see Silva using his Jiu-Jitsu when sparring with the tribesmen. He uses a triangle, kimura, arm bar and teaches them a Darce/Brabo choke.