57 species of waterbirds and another 14 species of wetland associated birds have been noted in the lake including 28 species of migratory waterfowl (most migrating from different parts of the northern hemisphere beyond the Himalayas). Also recorded were 425 species of animals—249 vertebrates and 176 invertebrates). The list includes rare animals such as the Indian python, sambhar and barking deer. Keibul Lamjao National Park is the natural habitat of one of the most endangered deer, the brow-antlered deer (Cervus eldi eldi) which was once thought to be extinct, which was declared a national park only to preserve and conserve this species of Eld's deer.