Man of the Hole
I wonder how the government officials were able to track him for decades? The Man of the Hole moved at least 50 times during that period in an area of 31 square miles (8,000 ha), which is one-third bigger than the land area of Manhattan. We see news reports about searching for lost hikers or campers, who want to be found, involving dozens of officials, volunteers, and dogs scouring the wilderness for days or weeks without success. Yet the Brazilians officials have been able to locate him many times.I wonder if they are using some sort of aerial surveillance. Maybe looking for heat signature from a fire at night? (Assuming he knows about or even needs fire.) Or perhaps trail cameras placed all over his territory. In a YouTube video the officials are seen giving him an axe and other gifts. A GPS locator hidden in the handle of the axe? I don't believe that's the answer, but thinking about all the nature videos I've seen in which GPS trackers are attached to birds, whales, mountain lions, and even house cats wandering the garden, it is at least technically doable.Hopefully there are some outdoorsmen here on HN who can shed light on how the tracking might be done.