Mostly found in Manipur .....

The Sangai, also known as the dancing deer, is a unique species of deer endemic to the state of Manipur in India. It is found primarily in the Keibul Lamjao National Park, which is the only floating park in the world. The Sangai is a symbol of Manipur and is protected under the Indian Wildlife Protection Act. The Sangai is a subspecies of the Eld's deer and is known for its distinctive golden brown coat and the unique way it moves, which gives it the name "dancing deer."

The Keibul Lamjao National Park, where the Sangai is mostly found, is located in the Loktak Lake, the largest freshwater lake in northeastern India. The park is a unique ecosystem that consists of floating biomass called "phumdis," which are a combination of soil, vegetation, and organic matter. The Sangai has adapted to this floating habitat and is found nowhere else in the world, making it a critically endangered species.

The Sangai is a symbol of Manipur and is deeply ingrained in the cultural and historical heritage of the state. It is often featured in local folklore and is a source of pride for the people of Manipur. The conservation efforts for the Sangai have been ongoing, and the species has been the focus of various conservation programs to ensure its survival.

While deer as a general category are found in many parts of India, the Sangai is a specific species that is endemic to Manipur. Therefore, when the question asks for a species mostly found in Manipur, the Sangai is the correct answer. The Sangai is not just a deer but a unique subspecies that is a symbol of the state and is protected under the Indian Wildlife Protection Act.