An interesting article on the ABC website outlining the future of Ghost Bats in the Mt Etna caving region:

One of Australia's longest running conservation campaigns is facing a disappointing end following a dramatic decline in one of the country's most important ghost bat colonies.

The Mount Etna caves north of Rockhampton, in Queensland, were at the centre of a major international conservation effort between the 1960s and the 1990s which eventually saw the area freed from limestone mining and converted to national park.

However, a study recently published in the journal Australian Mammalogy shows the ghost bat population at Mount Etna has declined by up to 80 per cent in the last two decades.

http://www.abc.net.au/news/2018-01-24/endangered-ghost-bats-still-fighting-for-survival/9348744