The Zoo Dirictor:
What , are them awake at night? They are just as those do not have sufficient area. If them awake at night, then we are surely not there!
It was a joke, but who the keepers think about this?
short-tailed fruit bats (Carollia) have a wingspan of about 20-30cm (8-12 inches), so they are fairly small. The wings are quite short and broad and they are very manouevrable fliers so they may fly easily in rainforest. Having said that, however, this cage is far too small and sad for these bats. Somehow I doubt they ever actually fly in there.