Great bat (Myotis myotis Borkhausen, 1797) was detected near the border with Lithuania - breeding colonies and single individuals were found at the Lomza in Poland and Ostroleka, Belarus and Latvia to the Grodno, Pape village. Therefore, the great bat prevalence of Lithuania is very possible. Looks like a pond pelėausį, however, for it greatly Font_bigger. Its body length 67 – 68 mm, weight - 25 – 45 g.
The development of ultrasonic frequency signals 37 kHz.