An undated handout picture made available by the Taronga Conservation Society Australia on 16 January 2015 shows koala joeys Bai'yali and Holly, at Taronga Zoo in Sydney, Australia. The poor eyesight of koalas has led to the species evolving to greet through nose touching and is a common way for koalas to determine if they're encountering a friend or a foe. (Photo by EPA/Taronga Conservation Society Australia)
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