Last Saturday, I met with fellow members of the Norwich Bat Group at Whitlingham to investigate 2 traditional Bat roosts in the vicinity. Even during the Winter, Bats become active every 20 days or so depending on temperature and and weather. What with the exceptionally cold weather, it was hoped that Bats would be using these tunnel roosts to keep warm, rather than the natural environment, for example trees. The temperature was 1.5 degrees outside, and inside the first tunnel we registered around 6 degrees in the tunnel and it didn't take long until the first Bats were located. 2 Brown Long-eared, 2 Daubenten's, 1 Natt-Daub and 7+ Natterer's were found. Most were found inside purpose built Bat Bricks. Although some years ago I joined the Suffolk Bat Group in Thetford forest for a nestbox check, I have not observed these delightful creatures at such close quarters for some time. What became apparent were the similarities, and differences, between Natterer's and Daube...