Indian Nuthatch

It is the only grey-backed, rufous-bellied nuthatch in the peninsula (Wikipedia, general species account).

It is similar to the chestnut-bellied nuthatch but has a smaller bill and a frosty crown paler than the mantle, and its wing and tail patterns lack contrast, with grey centres to the chestnut undertail coverts. Its habitats are subtropical or tropical dry, moist lowland and moist montane forests, and it breeds from February to July (Wikipedia, general species account).