With the help of Earthwatch volunteers since 2002, Leggett has been radio-collaring and tracking these enormous pachyderms in the Namibian desert to find out more about their home ranges and travel routes. Why? These elephants don't make very good neighbors - they drink upwards of 30 gallons of water per day, even in the dry season when water is scarce, and are extremely destructive eaters, pushing down and trampling trees and anything in their paths. Not surprisingly, elephants and people in this area have trouble coexisting.