Which Australian region is famous for its unique wildlife?

The Outback is renowned for its unique wildlife, making it the correct choice in this context. This vast, arid region that covers much of Australia is home to a diverse array of species that are specially adapted to thrive in harsh conditions. Animals such as kangaroos, emus, and various reptiles are commonly found here, along with a variety of birds. The remoteness and distinct ecosystems of the Outback provide a habitat for many species that are not found elsewhere in Australia, showcasing the country’s unique biodiversity.

While the Great Barrier Reef is famous for its marine life, including coral and fish species, it is not primarily a terrestrial wildlife region. Sydney Harbour, known for its iconic views and urban wildlife, does not showcase the same level of unique fauna as the Outback. The Blue Mountains offer beautiful landscapes and some native species, but they are not as synonymous with Australia's distinctive wildlife as the vast and varied ecosystems found in the Outback. This combination of factors highlights why the Outback is particularly famous for its unique wildlife.