Borneo, the world's third-largest island, harbors some of the tallest and most ancient rainforests on Earth. Sheltered beneath their dense canopies are jungle rivers, waterfalls and a host of wildlife that leaps, darts and crawls in the emerald depths. Endangered orangutans thrive in the lush vegetation, sharing branches and vines with leaf monkeys, wild gibbons, flying lemurs and more than 300 vibrant bird species. Rare proboscis monkeys are at home in coastal mangroves where hornbills and sea eagles soar above. In the forest beneath Mount Kinabalu’s prominent peaks, pygmy elephants lumber through the underbrush while monitor lizards sunbathe on the banks of the Kinabatangan River. Wildlife flourishes in Borneo, and we safari in search of it on a matchless tropical nature adventure.