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The aim of Australian scientists vaccinating koalas for chlamydia is to test a method for protecting the beloved marsupials against a widespread disease that causes blindness, infertility and death. Mark Baker/AP hide caption

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Mark Baker/AP

A koala joey named Humphrey is comforted by his mother, Willow, at Taronga Zoo in Sydney in March 2021. Australia's government has declared koalas endangered in New South Wales, Queensland and the Australian Capital Territory. Lisa Maree Williams/Getty Images hide caption

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Lisa Maree Williams/Getty Images