Araucaria forest and _campos_ grasslands on the highlands of southern Brazil. Diego Murta/Shutterstock When you think of a South American rainforest, you probably don’t imagine biting winds, heavy frosts and freezing temperatures. But in the mountains of southern Brazil, that’s exactly what you can find. On this highland plateau, far from Amazonia in the country’s coldest region, grows one of the world’s most intriguing ecosystems. For millions of years, this region has been home to a biodivers