Isolated Tribe Spotted in Brazil

I was fascinated to learn that there are some 100 tribes in the world with people who have not been contacted by modern day people. I didn't know there were any such people, let alone 100 tribes of them.

Below is a picture of tribe that lives in the area of the border between Peru and Brazil. The government is attempting to provide proof of these isolated tribes existence so that they can help protect the land the tribes live in.

I can only begin to imagine what these people thought when the plane was flying overhead. Wouldn't it be amazing to learn from them what they know? And to see how they talk about and draw pictures about their encounter with the metal bird?