Pictures of the moment a young koala was returned to its mother have been obtained by 9NEWS, after a three-day mission to reunite the pair.

The joey was found in the front yard of a home at Ridgehaven in Adelaide's north-east late last Thursday, but its mother was nowhere to be seen.

It was taken in by Wayne and Lynette Parsons from Fauna Rescue SA, who had to bottle-feed the joey formula every three hours to keep it alive.

A mother koala has been reunited with her baby after three days apart. (9news)

The pair are set to return to the wild in the coming days. (9news)

Footage of the adorable reunion was obtained by 9NEWS. (9news)

The couple returned to the house every morning and night to search for the mother but she couldn't be found.

Eventually, on Sunday, the residents called Wayne and Lynette to tell them the mother had finally returned.

She was brought down from the tree and taken to their home where the reunion occurred.

The joey was bottle-fed formula every three hours. (9news)

The joey is about five months old and weighs 1.1kg. (9news)

"Mum just grabbed the Joey and didn't stop cuddling it all day on Sunday. They just held each other, it was beautiful," said an emotional Lynette Parsons.

"It doesn't happen that often that you find mum and baby and get them back together, so it was the greatest feeling."

Lynette and Wayne said the joey was about five months old and weighs 1.1kg.