This video says about itself:
Bats’ warm hibernation alters scientific thinking
10 May 2015
Israeli researchers discover that mouse-tailed bats can hibernate at constant warm temperatures, the first time that a mammal has been shown to do so. Sharon Reich reports.
Translated from the Dutch Natuurmonumenten conservationists:
Record number of bats in the High Country of Vollenhove
Feb 2, 2016 – At least 65 bats were spotted by forester Ronald Messemaker on Wednesday, January 27th in the Vitens bat bunker just outside St. Jansklooster. It thus appears that the High Country of Vollenhove and De Wieden is an ideal combination for bats.
The number of bats in the High Country of Vollenhove has been increasing for years. “Last year I wrote 57 animals on my notepad. Newcomer is the whiskered bat,” says an enthusiastic Messemaker. Furthermore two brown long-eared bats and 21 Daubenton’s bats stay there. The latter have increased enormously. Last year there were 6. Natterer’s bats unfortunately fell from 48 to 41.