Since 2006, the Little Brown Myotis has been dying in significant numbers in the eastern U.S. and Canada from a fungal disease called white-nose syndrome. The fungus that causes white-nose syndrome grows in humid cold environments typical of the caves where bats hibernate. Bats with white-nose syndrome show loss of body fat and unusual behaviour during winter, including flying outside in the day. They very often die of the disease.
White-nose syndrome has not been reported in the NWT but it could eventually spread north. A map of its spread is available at whitenosesyndrome.org. It is estimated that at the current rate of spread, the fungus will severely impact the entire Canadian population of Little Brown Myotis within the next two decades.
To avoid disturbing bats and potentially spreading white-nose syndrome, avoid entering caves and abandoned mines where bats may be hibernating.