Long-tailed Birch Mouse

The long-tailed birch mouse grows to about 6.7cm long with a tail close to twice its body length. The dorsal fur is pale greyish-brown tinged with yellow, with longer black-tipped hairs forming a stripe along the spine. The flanks are paler yellowish-brown, the underparts greyish creamy-white, and the tail a uniform light yellowish-grey. It is found in north-east Asia (Wikipedia, general species account).

It builds its nest, a woven ball of grass, in crevices or bushes. It eats green plants and berries but mostly seeds, is chiefly active at night and spends the day in a shallow burrow. Litters usually consist of four to six young. Its ecology is little known (Wikipedia, general species account).