" Let's not forget Australian mammals which are not marsupials, such as the grey-headed flying-fox (Pteropus poliocephalus) on the left and on the right, a ghost bat (Macro-derma gigas).
'All bats have three flight membranes that form the main body of the wing. The membranes are essentially modified skin stretched around a framework of bones,' writes Vogelnest and his co-author Graham Allan.
In the microbats, there is a fourth membrane which stretched the tail to the legs. This is used like a large air brake, allowing the bat to make abrupt changes in flight trajectory and speed. "