Australia - Flying Foxes in the Sydney Royal Botanical Garden

Flying Fox

All of these Flying Foxes are in the Sydney Royal Botanical Garden and they are a real pest.  They are overwhelming the garden and slowly killing some trees.  The garden has recently received approval to use non-harmful methods to discourage them from roosting.  The Botanical Garden in Melbourne uses sound blasts to scare them off.  The blasts are every ten seconds and they are annoying.