North America's prairies once were home to millions of wild animals. Today, most of that land is farmed or developed, but some grasslands have never been plowed and could be rewilded.
Fire has been viewed as the main protagonist in creating Africa's iconic savannas. However, new research shows that browsing animals created savannas millions of years before fire became important.
South Sudan is a country where conflict is rife. This has had a knock-on effect on the country's rich and varied fauna, and put conservation programmes in severe crisis.