The days are getting shorter, the temperatures are dropping. Numerous animals are migrating south, others are seeking their hibernacula—including bats. However, while hibernation is becoming shorter and shorter for many animals due to climate change, researchers at the University of Greifswald have now published findings in Global Change Biology that reveal that Daubenton's bats (Myotis daubentonii) are now entering hibernation a whole month earlier than they did 13 years ago.