This joey is the start of the fourth generation of bandicoots in the park, following the species' reintroduction to the area six years ago.

For the rangers, it a sign that the population is thriving and the endangered animal is on its way back from the brink.

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Booderee National Park natural resources team leader Dion Maple said the local bandicoot population has grown to the point where they don't need human intervention - though they like to keep an eye on the critters.

"It is difficult to provide an exact number of southern brown bandicoots now living in Booderee National Park," he said.

"But we are confident that the species has now established a self sustaining population due to the amount of times we are picking them up through our ongoing monitoring."

Southern brown bandicoots were first reintroduced to Booderee National Park in 2016, starting with a group of 11 creatures. Another 12 were brought in during 2017, and five during 2018.

At the time, it had been almost 100 years since southern brown bandicoots were sighted in the park.

Mr Maple said the main culprit for their demise was the fox, and rangers have been on a lengthy campaign to eradicate the pest.

"The introduction of the red fox to Australia has resulted in the extinctions and local extinction of many small native mammals," he said.

"Booderee National Park has undertaken intensive fox control in the park for more than two decades.

"This has allowed us to successfully re-introduce the southern brown bandicoot into Booderee after it had been locally extinct in the area for almost a century."

In New South Wales, the southern brown bandicoot is officially recognised as an endangered species.

Only two groups can be found in the state - one on the south coast, and another near Sydney.

Historically, they were found across much of southern Australia, and outliers had even been spotted in the Northern Territory and far north Queensland. Though their distribution decreased significantly in the wake of European settlement, for many reasons.

Southern brown bandicoots generally life a solitary lifestyle, and are mostly nocturnal.