BBC NEWS | World | Americas | Isolated tribe spotted in Brazil With all due respect to the people shown (I hope this and the subsequent encounters with their pride, health and happiness intact!), I am wondering as to what went through their heads as they were firing arrows on the surveyor plane... "Holy crap! A ginormous eagle that makes crazy noise. Let's kill it before it steals our children!" or "Damn, they found us! Let's bring it down before they tell anyone else!"