Lesser horseshoe bats
We’re following a bat roost in the rafters of a former iron ore smelting furnace.
There seem to be around 20 lesser horseshoe bats on first inspection, but we think there maybe a few more than that. We're not covering the whole interior of the building with our cameras. The bats will shift around under the slate roof as it heats up during the day, and being an old building, there are nooks and crannies for our bats to roost in before heading out to feed at night.
This is what's known as a 'maternity roost', where female bats seek out warm, safer places to have their babies but these maternity roosts will often have last year’s juvenile males and the occasional mature male as well.
It’s dark all the time in the roost, so our cameras are infra-red 24hrs a day.