Both African and Asian elephants migrate each year, the distance of migration depends on their habitat and the intensity of dry and rainy seasons. For example, many African elephants face long dry seasons and therefore migrate longer distances than Asian elephants that dwell in deciduous forests that experience less extreme moisture variations (Groning 1998). Increasing human populations are a problem for African elephants' migration because they have caused routes of migration to be cut off and have settled territories that used to be available for elephants (Johnsingh & Williams, 1999). In recent years there has been an increase in drought conditions in Africa as a result of overgrazing and deforestation for agriculture (United Nations 2007). These increased droughts may affect elephant migration patterns, as they may have to travel longer distances to find water. These drought conditions combined with the decreasing mobility of elephants as a result of increasing human populations may prove to be very detrimental to African elephants ability to migrate and avoid stressful dry seasons.