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Christine Adams-Hosking

In this photo released by G20 Australia and taken on Saturday Nov 15, 2014, Prime Minister of Australia Tony Abbott and President of Russia Vladimir Putin hold koala's during a photo opportunity on the sidelines of the G-20 summit in Brisbane, Australia. (AP Photo/G20 Australia,Andrew Taylor) (AP)

A report claims koalas are “functionally extinct” – but what does that mean?

Christine Adams-Hosking