Chance encounters near an isolated Amazon tribe have resulted in the most detailed pictures ever taken of them.
Campaign group Survival International has released images of the Mashco-Piro tribe, which lives near the Manu National Park in southeastern Peru.
The tribe has had little if any peaceful contact with the outside world, but sightings are on the rise.
Survival blames the change on gas and oil projects and illegal logging in the area, pushing the tribe into new lands.
The message that the Mashco-Piro tribe seems to be sending, however, is that they want to be left alone.
"There's been increasing conflict and violence against outsiders that are on their ancestral land," Survival's Peru campaigner Rebecca Spooner told BBC News.
That violence has included arrows being fired at tourists in passing boats, and a warning arrow - with no tip - being recently fired at a Manu park ranger.