Dylan Dreyer explores South America's Andes Mountains where the tumultuous weather and treacherous heights cause many unusual animals to form specialized behaviors in order to survive; plus what life is like for the descendants of the Incas.

Dylan Dreyer returns to South America to visit some favorite animals, including pumas, egrets and crocodiles, who make their homes around Venezuela's Orinoco River, and red howler monkeys and harpy eagles in the Amazon rainforest.