With the onset of September, the waters of the Okavango begin to recede and the dry season begins to envelop the region in earnest. For many animals, finding food becomes a daily struggle, and many herbivores have to go longer distances in search of good grazing. The Boteti River at the edge of the Makgadikgadi National Park has also been affected by climate change, and while it flowed year-round before the mid-1990s, it has been dry ever since, only discharging seasonal rains into the Makgadikgadi Pans.