The Park is listed as a World Heritage Site and is the most popular safari destination in Nepal. It covers a unique ecosystem, containing hills, ox-bow lakes and flood plains. Dominated by sal forests, the park has 50 species of grasses. The 43 species of animals include the endangered one-horned Asian rhino, Royal Bengal tiger, gharial, fresh water crocodile, gaur, wild elephant, four-horned antelope, striped hyena, pangolin and Gangetic dolphin among warm-blooded animals. It is also home to a large variety of reptiles such as pythons, monitor lizards, cobras, kraits, Russel's vipers, saw-scaled vipers and rat snakes.