The astonishing images, showing curious adults and children peering skyward with their faces dyed reddish-orange and toting bows, arrows and spears, were taken by Brazil's National Indian Foundation (FUNAI).
Rights group Survival International, which accompanied the government agency on the overflight near the Brazil-Peru border, said their baskets were full of papaya and manioc grown in a communal garden.
"Illegal loggers will destroy this indigenous people. It is essential that the Peruvian government stop them before it is too late," warned Survival's director Stephen Corry.
FUNAI has released similar photographs in the past and acknowledged that Peruvian loggers are sending some indigenous people fleeing across the border to less-affected rainforests in Brazil.
In 2008, indigenous tribes expert José Carlos Meirelles released a set of photographs that allegedly documented an uncontacted tribe. Those images were later determined to be staged in an elaborate hoax that Meirelles claimed was intended to raise awareness of logging.
The coordinator of Brazil's Amazon Indian organization COIAB, Marcos Apurina, said he hoped the images would draw attention to the plight of the indigenous peoples and encourage their protection.
"It is necessary to reaffirm that these peoples exist, so we support the use of images that prove these facts. These peoples have had their most fundamental rights, particularly their right to life, ignored -- it is therefore crucial that we protect them," he said.
FUNAI says there are 67 tribes in Brazil that do not have sustained contact with the outside world. Some are often referred to as "uncontacted" tribes even though they have some kind of, albeit limited, contacts.
A year ago, rights groups sent a letter to then president Luiz Inacio Lula da Silva voicing concern that the very survival of indigenous groups was under threat.
Brazil's latest census counted more than 500,000 indigenous people among more than 190 million Brazilians. Millions in the country, however, have some indigenous ancestry.
Most indigenous people in the Americas descend from Asian people who crossed a land bridge from Siberia, an estimated 13,000-17,000 years ago. One notable exception: the indigenous people on Chile's Easter island, in the Pacific, are ethnic (Rapa Nui) Polynesians.
Discovery News. 2011. "Uncontacted Amazonian Tribe Spotted in Rare Photos: Big Pics". Discovery News. Posted: February 1, 2011. Available online: http://news.discovery.com/human/amazon-tribe-rare-photos-110201.html
Photos credit: Gleison Miranda/FUNAI/Survival