this remote corner of the world is the place andrea turkalo, a field biologist from taunton, massachusetts, has called home for nearly two decades. andrea lives in a compound that she and a group of pygmies built from scratch. the pygmies help her run the place. commuting to her job is a hike. the last couple of miles took us through some interesting terrain. >> andrea turkalo: okay, now we're going to enter the forest. and the advice i like to give everyone at this point is to stick together. >> simon: stick together? >> turkalo: yeah. because if we happen to run into elephants, we should all stay together and move in the same direction so we don't confuse them. >> simon: we don't want a confused elephant. a confused elephant could be dangerous. fortunately, running into one on the trail is rare. so who made this trail, andrea? >> turkalo: this was made by hundreds of years of elephant traffic in this forest. >> simon: elephants made the trail? >> turkalo: yeah, i mean, if you look at their feet, it's obvious. they... you know, they do a lot of road work. >> simon: the elephants have stom