The bats often passed by the Highrise as they went off to wherever they found food. For a while after they were driven away we saw very few but they have certainly returned now, the difference being they fly past at night later and return earlier in the early morning. Our Friend from Japan was recently staying with us and she took a decent walk in the Botanic Gardens and chatted to staff there (and fed her face I might add) and established the bats have not returned, so they are obviously flying quite a distance from Yarra Bend Park to pass us by on their way to feed, which I guess why they are now passing later and returning earlier than they used to.
The bats are known here as grey-headed flying foxes and they are relatively large bats, weighing up to 1 kilogram and with a wing span of up to 1 metre. Luckily they are not fond of human blood taken from the neck but eat fruit, flowers and pollen.
Here is an individual and a colony at daytime roost. Photos from Wikipedia.