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Australia has listed the koala as an endangered species across most of its east coast, after a dramatic decline in numbers.

The once-thriving marsupial has been ravaged by land clearing, bushfires, drought, disease and other threats.

Australia's Environment Minister, Sussan Ley, explains why climate change and chlamydia is playing a big role in their decline.

Photo: A koala 'piece to camera' in Australia Credit: ³ÉÈË¿ìÊÖ