The Chestnut-bellied Nuthatch (Sitta castanea), is a species of bird that is found in Bangladesh, Bhutan, Cambodia, China, India, Laos, Myanmar, Nepal, Thailand, and Vietnam. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical moist lowland forests, and subtropical or tropical moist mountains. This bird has been separated into two distinct subspecies.
The Indian Nuthatch (S. castanea), is found south of the Ganges River. It is the only gray-backed, red/brown-bellied nuthatch on the peninsula. It is similar to the ladder species but has a smaller bill and a frosty crown that is paler than the mantle. The wing and tail patterns lack contrast and has gray centers to the chestnut undertail coverts. .
The Chestnut-bellied Nuthatch (S. c. cinnamoventris), is found more in the Himalayas. The bill is heavier than the Indian Nuthatch, and the crown and mantle are of the same shade. The wing and tail show contrasting markings, silvery-edged primary feathers, and blackish inner webbing. Large white spots mark its tail