Zimowanie gacka szarego Plecotus austriacus (Fischer, 1829) w rezerwacie przyrody „Nietoperek”

„Nietoperek” bat reserve is one of the largest bat hibernacula in Europe. Over 30,000 bats of from 9 species hibernate there every year. The reserve is in Lubuskie Voivodeship, at the northern edge of the Grey Long-eared Bat range in Poland. Few individuals of this species wereobserved in „Nietoperek” in the 1980s and 1990s. Later this species was noted only in bunkers placed on the ground in the reserve. Here we report two observations of the Grey Long-eared Bat in „Nietoperek” reserve on 03.02.2017 and 09.02.2019. These observations were in the first half of February, while the coldest temperatures occurred in January. The presence of this species might result from its reaction to cold temperatures in previous weeks.