This cage was gifted by the Synchronicity Foundation in the United Kingdom. It is an 8 metre octagon with 3 metre sides and 3 -3.5 metres high. A ‘human area’ 3 metres by 2 metres allows entry through 2 doors into the octagon. The cage is lined externally with 6mm by 6 mm wire mesh, and internally with 6mm by 6mm plastic mesh on the sides, and a very small weave netting on the ceiling. The entire roof is covered with solarshield plastic. The floor is covered with black weedmat to prevent grass growing through and soil coming up, and allows any rain to drain away. The weedmat is covered with a pale shadecloth so that it is easy to see any grounded bats. Roost areas are set up around the central pole and on the octagon sides. Two fluoro lights, one black and one white are installed on mains electricity above the central roosting area. We turn the white light on at dusk until we go to bed to encourage insects into the cage, and leave only the black light on overnight.