Asian Particolored Bat

The Asian parti-coloured bat is a medium-sized vesper bat with a broad muzzle, dark ears and membranes, and dense fur. The upper coat is dark at the base with paler tips, producing a frosted appearance, while the underside is lighter. It resembles the Eurasian parti-coloured bat, and reliable separation may require skull, dental, or genetic characters rather than colour alone. (Wikipedia, general species account)

The species ranges through eastern Asia, including Mongolia, China, Korea, Japan, and the Russian Far East. It uses forest margins, wetlands, farmland, and towns, roosting in tree hollows, rock fissures, and buildings. Flying insects are caught in open air, sometimes around lights. However, the opened detailed general biological species account did not provide dependable Mongolia-specific roosts, seasonal movements, reproduction, or a named viewing locality. (Wikipedia, general species account; Mammal Diversity Database)