"Following the initial declaration of 'functional extinction' in May, Christine Adams-Hosking, a conservationist at the University of Queensland, penned an article for The Conversation more accurately outlining the fate of the koala in Australia. In it, Adams-Hosking made it clear the functional extinction tag was one likely applied with a little too much haste. In a study conducted in 2016, a collaboration of researchers attempted to quantify how many koalas were left, but it's a complex game."

https://www.cnet.com/news/koalas-are-not-functionally-extinc...