Russian Myotis

The eastern water bat, listed here as Russian myotis, is a small Myotis measuring 44–58mm, with a 34–39mm forearm. It has short dense dark-brown dorsal fur, a greyer to whitish underside, a broad bare muzzle, and comparatively large feet. Its tail is enclosed in the broad interfemoral membrane. It was long treated as an eastern subspecies of Daubenton's bat before being revalidated. (Yoshiyuki; Matveev et al. 2005, as summarized on Wikipedia)

It occupies forested river valleys from eastern Siberia through Mongolia, northern China, Korea, and northern Japan. Small flying insects, especially flies and moths, are taken mainly over water. Summer roosts include tree hollows, bridges, and buildings; females form colonies and usually produce one pup, occasionally two, after a reported 50–55-day gestation. Deep caves and abandoned mines commonly hold winter groups. (Smith and Xie 2008; Matveev et al. 2005, as summarized on Wikipedia)