Man seems to be the only animal having significant impact on bat populations.
Drastic reductions in bat populations have occurred during recent years in the United States and worldwide. Human disturbance to hibernation and maternity colonies is a major factor in the decline of many bat species. Even well meaning individuals such as cavers and biologists cause these disturbances. Hibernating bats arouse from hibernation when disturbed by people entering their caves. When aroused, they use up precious winter fat needed to support them until insects are again available in spring.