The largest-known brown long-eared bat roost that is counted as part of the National Bat Monitoring Programme is located in Derbyshire. The annual count undertaken in June each year has over 200 individual bats emerge (most brown long-eared roosts max out at around 60). It's a maternity roost where females gather to give birth to one baby each year.
To help the homeowner keep on top of the droppings which build up each year, we go along in the winter to replace the plastic sheets which catch all the droppings (under Natural England licence). Just one bat was in residence this time but with the weather starting to warm up, it won't be long until the numbers start to build!
