[2] It has been reported from the Ussuri region of Manchuria, Sakhalin Island and Primorsky Krai in Russia, and northern North Korea.

The dorsal fur is pale greyish-brown tinged with yellow and along the spine are longer hairs tipped with black forming a vertebral stripe.

[3] The long-tailed birch mouse is native to northeastern China and the Ussuri region of Russia as well as being found on Sakhalin Island.

This birch mouse eats green plants, berries but mostly feeds on seeds, being chiefly active at night and spending the daytime in a shallow burrow.

The population trend is unknown, so the International Union for Conservation of Nature has listed it as "data deficient".