On being naked and listening to birds

I met a man today who has been walking for 18 years straight. He started in Goa (on the western edge of India) and made his way north on one side of the country to Kashmir and then back south all the way to Tamil Nadu (the state we live in). His goal is to visit every tribe in India, which he will accomplish in three months. He has spend roughly 10 weeks with each tribe, and by walking with people he got to know them and their patterns of life. He spoke of a tribe in Bihar who state that they work very hard, in that they very forcefully relieve people of their valuables. There is a tribe in Andhar Pradesh who is very devout and holy to the hindu god Shiva, bathes once every 12 years and feeds on the dead bodies of a nearby tribe. Another tribe prizes the meat of dogs, with the meat of a black dog going as much as 2,000 rupee per kilogram, roughly $5 a pound.
One of the most interesting stories was a primitive tribe in the Andaman/Nicobar Island chain, which is situated west of India in the Arabian Sea. This tribe believed in wearing no clothing and would shoot arrows at clothed people who approached. The government deemed that they must be clothed, what an outrage! So once a month, for three days, they would visit the tribe and present them with clothes. In order to get them to wear the clothes, they would bribe them with bananas and cocunut, which they would get for free only if they had the clothes on. As soon as the gov’t workers would leave, the clothes would come off. So this chirade continued for some months. I imagined how funny this scene began to look on the beach; a bunch of naked people, a stack of disregarded clothing surrounded by stacks of coconut shells and banana peels, and arrows flying in the air chasing a government car.
In 2004 the tsunami struck here and about 100 people died on the Andaman/Nicobar Islands, but not one of them was from this naked primitive tribe. Apparently, the day the tsunami struck, this tribe noticed that all of the birds were flying away, inland, up into the hills. So this tribe followed the birds- they knew something was wrong, these birds normally never fly inland. The tsunami struck. This tribe was safe because they listened to the birds. The man confirmed my thought, which is if this tribe is civilized and clothed, would they still listen to the birds? Would they understand them in such a thorough way?