Micromys pygmaeus
Diet
Chiefly seeds and insects, with some nectar and fruit (Eurasian harvest mouse account)
Habitat
Cereal fields, reed beds, long grass and hedgerows (Eurasian harvest mouse account)
Size
Eurasian harvest mouse: body 55-75mm, tail 50-75mm
Weight
4-11g (Eurasian harvest mouse)
The pygmy harvest mouse, Micromys pygmaeus, is a harvest mouse of the genus Micromys, and the account used here is for the Eurasian harvest mouse, Micromys minutus. The Eurasian harvest mouse is the smallest European rodent: body 55 to 75mm, tail 50 to 75mm, weighing 4 to 11g, with reddish-brown upperparts, white to cream underparts, large eyes and ears and a naked, prehensile tail (Wikipedia, general species account).
It climbs skilfully, gripping stems with its feet and tail, and feeds chiefly on seeds and insects with some nectar and fruit. It builds round, tightly woven grass nests attached to stems above the ground, in cereal fields, reed beds and long grass. The source covers the Eurasian species and does not mention India or the Himalaya, so nothing here is confirmed for the Indian animal (Wikipedia, general species account).