Once described by Charles Darwin as "one great luxuriant hothouse made by nature for herself," the Heart of Borneo is home to 10 primate species, more than 350 bird species, and 150 reptile and amphibian species. In addition, a staggering 10,000 plant species are sheltered by the region's rain forests. During the past three years, scientists have discovered more than 123 new species in this island within an island. These finds include the world's longest known stick insect, a flame-colored snake and a color-changing frog. Take a closer look.