| Big brown bat has only been observed to over-winter in New Brunswick in urban settings, where they use buildings as hibernacula. |
| The burrows they hibernate in, called hibernacula, cut off most cues to the world above. |
| Individual snakes may brumate in burrows, under rock piles, or inside fallen trees, or snakes may aggregate in large numbers at hibernacula. |
| During the latter part of August, the larvae descend to the base of the trunk and overwinter in white silken hibernacula. |
| In some hibernacula, populations plunged by as much as ninety-seven per cent. |
| They moult in the newly constructed hibernacula and remain there until spring. |
