While studying modern koala teeth can provide some insights into their diet, it may not give a comprehensive understanding of what ancient koalas ate millions of years ago. The dental features and dietary preferences of koalas have likely undergone changes over time due to evolutionary adaptations and environmental shifts.

To accurately determine the diet of ancient koalas, paleontological evidence, such as fossilized remains of koalas and their food sources, would be more informative. By analyzing the fossilized teeth, jaws, and gut contents of ancient koalas, scientists can gain valuable information about their dietary habits and adaptations. Additionally, studying the preserved plant materials from the same geological period can provide insights into the available vegetation and potential food sources for ancient koalas.

Combining paleontological evidence with ecological studies of modern koalas and their dietary specializations can help researchers reconstruct the evolutionary history of koala diets and their response to changing environments over millions of years.