The Northern Bat is a boreal bat, a glacial relict in the Alpine arc. Adapted to the cold, it resists temperatures close to -7°C for short periods of time. The Northern Bat is a discreet species that lives in boreal forests scattered with humid areas. It sometimes hunts near to public lighting, one of the only places where it is easy to observe it. The capture of females at this site has enabled us to believe in the presence of a colony at Gioberney. It would be the first known reproducing colonies in France.