* No National Koala Census: Australia doesn't conduct regular nationwide koala censuses.
* Population Estimates Vary: Estimates of koala populations come from various sources like local studies, surveys, and expert opinions. These estimates can change based on the methodology used and the region being studied.
* Koala Populations Fluctuate: Koala populations are dynamic and are affected by factors like habitat loss, disease, bushfires, and drought.
Where to find some information:
* Australian Koala Foundation: You might find some general population estimates on their website, though they may not be specific to 2005.
* Scientific Journals: Search for academic articles on koala population dynamics and conservation in Australia. You might find estimates or data from around that time period.
It's important to understand that any number you find will be an estimate and not a precise count.