The first koala to be born in the ACT since the 2003 Canberra bushfires has made his debut at Tidbinbilla Nature Reserve.

The five-month-old male joey is named Tucker, short for bush tucker.

"Tucker is certainly tucking into his tucker and looking very, very comfortable," ACT Parks and Conservation regional manager Brett McNamara told 666 ABC Canberra.

"He's at the age now where he's just starting to poke his head out and explore the world."

Tidbinbilla is home to the ACT's only koala population, with two males and two females in the breeding enclosure and another nine in the free range space.

Tucker's parents, Yellow and Jed, were brought to Tidbinbilla as part of a translocation project from Victoria's Otway Ranges in September 2013.

Tucker is likely to start climbing out of his mother's pouch onto her back in the next month. ( Liz Nicholls )

Although Tucker is the first joey to be born there in 13 years, Mr McNamara said breeding strategies were in place to prevent overpopulation.

"Koalas, given the right conditions, can quickly overpopulate," he said.

"These are captive animals within the enclosure — we need to be very conscious of maintaining that ecological balance as well as also welfare issues."

Tidbinbilla celebrates 80 years

Tucker's arrival coincides with Tidbinbilla marking 80 years as a sanctuary for native plants and animals.

"We historically know koalas did populate this region," Mr McNamara said.

"One of the first animals to be introduced into the sanctuary 80 years ago was koalas.

"Here we are some 80 years later, still enjoying the success of a koala breeding population."

Mr McNamara said the koalas joined the corroboree frogs, brush-tailed rock wallabies and bettongs as animals successfully reintroduced to the area.

"This is what Tidbinbilla was designed for ... to assist with the introduction of wildlife into the local environment," he said.

Yellow was one of the koalas brought to Tidbinbilla from the Otway Ranges in 2013. ( Liz Nicholls )

Tidbinbilla's koala population was wiped out during the 2003 bushfires.

The only koala to survive was the famous Lucky.

"Lucky became very symbolic for us as a community in terms of being able to survive the fire and that sense of resilience and recovery," Mr McNamara said.

Visitors to Tidbinbilla can see Tucker emerging from his pouch at the koala enclosure and join a ranger-led tour on Saturday afternoons.