I used to see large dark shapes flying in groups at night around my place. I guess there was a Flying Fox colony around. They migrate to be close to food sources, there large about the size of a cat. Fruit-eating bats. For years, nothing but a bit annoying, loud and messy if there neat your house. And then they were linked to Equine Morbility Virus, the origin of a Virus that jumped from them to Race Horses and then into a Horse trainer, and it killed him. Strict guidelines now about avoiding contact. BTW Acubras are great hats but useless if you're moving about on a motorcycle, very hard to carry about. Floppy Cancer Council wide brim hats are way easier to pack. We have the largest rate of Skin Cancer in the world, wear a hat for sure.