House Mouse

The house mouse is a small, lightly built rodent with a pointed muzzle, rounded ears and a long, almost naked tail. Wild animals are usually grey-brown above and paler below, whereas domestic and laboratory strains vary greatly in colour. The feet are narrow and the incisors grow continuously. Adults commonly measure about 7.5–10 cm from nose to rump, with a tail of similar length, although size varies among populations and living conditions. (Wikipedia, house mouse account)

House mice are exceptionally adaptable and occur both around people and in natural habitats. They are mainly nocturnal, explore familiar routes using smell and touch, and eat grain and other seeds while opportunistically taking varied plant and animal foods. Females can breed repeatedly when food and shelter permit; litters are born in concealed nests made from shredded material. Their association with stored food has carried them worldwide. No Mongolia-specific habitat or viewing place was supported by the opened general account. (Wikipedia, house mouse account)