Kaziranga National Park

Kaziranga National Park - Home of the Indian one-horned rhinoceros
Kaziranga is a national park in the state of Assam, India. The sanctuary, which hosts two-thirds of the world's great one-horned rhinoceroses, is a World Heritage Site. According to the 2018 census, Rhino population in the park was 2413. The Park is also recognized as an Important Bird Area by BirdLife International. There's a great sighting of Great Indian Hornbill at 26:39 in this video.
The best time to visit Kaziranga is anywhere from November to April (although I personally prefer February). The Park floods in the months of June, July and August when it is closed to visitors.