Common Name: Chestnut-bellied Nuthatch
Scientific Name: Sitta castanea 
Nepali Name: Katuse Matta ( कटुसे मट्टा )
Size: 12 cm 
Location: Chitwan, Nepal

Chestnut-bellied Nuthatch is residents and common in forests, groves (a small wood or other groups of trees), and is found below 1830m. The male has a light blue-grey upper mantle and a deep chestnut colored underparts with white fringes to the under tail-coverts. There is a black stripe from lores to the nape. The cheeks and upper throat are white. The female has paler underpart. These birds can be found single, in pairs, or more. They are often spotted clinging and climbing up the barks of trees searching for food. Their diet comprises of insects, seeds, and nuts. 

The above picture is of a female Chestnut-bellied Nuthatch.

Please feel free to comment below if the above species has been misidentified.