Fig 4. Trail following by the Me’Phaa out of Agua Tordillo small village.

This is a typical example of a GPS recorded trajectory followed by an individual while executing a firewood searching exploration in the Guerrero Mountains in Mexico. The full trajectory is depicted overlaid in the map showing the main dirt roads used for walking. A is the start of the trajectory while B marks its end and the site where most of the wood search and collection has taken place. Once the individual goes off the dirty road (R) near the end of the trajectory, he goes into the woods following a network of footpaths (F). In the inset, a section of the outward and inward walking trajectory, as registered by the GPS, is shown overlaid over the almost straight line geometry of the dirt road segment. Notice the walker meandering across this bounded terrain feature. Map elaborated from our own GPS records. See S1 File for more details about this figure.