Security footage of a koala wandering unhindered through the emergency ward of an Australian hospital has become the latest viral video on the internet, with tens of thousands of people watching the curious critter online.

Security cameras captured the koala, an Australian native marsupial, strolling through the automatic doors of the emergency department at around 3:30am (1830 GMT the previous day) in the morning of April 20.

It is seen wandering back out again when it triggered the automatic doors.

Staff at the Hamilton Base Hospital in regional Victoria apparently knew the visit was underway but decided to leave the animal to its devices, local media reported.

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