Khao Sok’s vast terrain makes it one of the last viable habitats for large mammals. During rainy months you may spot bears, boars, gaurs, tapirs, gibbons, deer, marbled cats, wild elephants and perhaps even a tiger. And you'll find more than 300 bird species, 38 bat varieties and one of the world’s largest (and smelliest) flowers, the increasingly rare Rafflesia kerrii, which, in Thailand, lives only in Khao Sok. These giant flowers can reach 80cm in diameter.