What happened in Mozambique between 1977 and 1992? How did this event affect the size of Gorongosa National Park's elephant population?

A male elephant grabs an evening snack in Mozambique's Gorongosa National Park. Most of the park's elephants were killed for their ivory, used to buy weapons during the nation's 15-year civil war, which ended in 1992. With poaching controlled, the population is recovering.