More than 40,000 elephants roam Hwange National Park in the dry season, where they access artificial waterholes to survive seasonal drought. Elephants visit the waterholes every other day throughout the dry season but vanish when the rains arrive between October and December. Tracking with GPS collars revealed that elephant families move throughout the national park during the wet season as they become less dependent on the waterholes, likely reducing competition for food. An estimated 20 percent of animals leave the unfenced park and migrate west into Botswana for the wet season, sometimes