Bharatpur District is famous for Keoladeo National Park, a major wintering area for migratory birds. Established as a duck-hunting reserve by the Maharajas of Bharatpur, it was known as the best duck shooting resort in the British Empire. The site was declared a bird sanctuary in 1956 and later upgraded to National Park. UNESCO has listed it as a world heritage site. Keoladeo National Park attracts 364 species of birds, including many from India, but also from Afghanistan, Turkmenistan, Siberia, China and Tibet, including the rare Siberian Crane. As the monsoons arrive and the wetlands and marshes start to fill with water, birds start pouring into the park.