Uncontacted tribe in Amazon

This photo released yesterday depicts members of a tribe in the Amazon rain forest firing arrows at an airplane. Apparently, the tribe has never had any contact with humans outside of their own group. And there are likely many other "uncontacted" tribes in the region too. From National Geographic:

"We are very confident the photos are genuine," said Miriam Ross, a spokesperson for Survival International, which estimates that half of the hundred or so uncontacted tribes in the world live in the rain forests of Brazil and Peru.

Some experts say few, if any, tribes have had no outside contact. It's more likely is that previous generations had negative encounters, prompting social taboos that continue to drive clans deeper into isolation.

Due to their vulnerable immune systems, these groups are highly susceptible to diseases borne by outsiders such as missionaries, loggers, or oil workers.

While this photo may be of what it claims it is there are a few details that lend credence to it not being as it claims such as their wearing of clothing and what appears to be a metallic object near the shelter.

But, the biggest factor is the fact you can see the humans in the photo - not having 'experienced' the modern world and 'airplanes' the survival instinct of the humans of this group would be to hide from such a large and noisy flying animal as the airplane would appear to them rather than show aggression.

One must remember in the wild large and noisy means trouble and no species wants trouble if they can avoid it.

There are an unknown number of human groups living in the Amazon and other regions of the world who we have had no contact with and these people could well be one of those groups ... the National Geographic Society usually is spot on, on such as this and as stated above they feel the photo is real.

But for the reasons I stated I think the people pictured have had some contact - maybe fourth or fifth handed, but contact nonetheless and they weren't that all fired impressed by that contact.