The populations of the two species are under threat as fires ravage their home of Kangaroo Island off the southern coast of the country, the Independent reported.
"That's a message for people around the country - put your hand up if you need help".
Meanwhile an emergency warning is in place for a fast-moving and uncontrolled bushfire near the Eyre Highway in Western Australia's southeast.
The unprecedented fire crisis in southeast Australia that has claimed at least 26 lives since September, destroyed more than 2,000 homes and scorched an area twice the size of the USA state of Maryland has focused many Australians on how the nation adapts to climate change.
The Dec. 16, 2019 image of Kangaroo Island shows the island greenery still intact. With the intense heat and fires now raging in Australia, parts of the country have been dealing with "pyrocumulonimbus" clouds - weather systems generated by the intense heat of the fires themselves, which bringing little rain but are packed with lightning that can spark new fires. Nearly a third of the island has been destroyed by the bushfires and Terra's latest images show many burn scars across the landscape.
NASA's Terra satellite snapped an image of Kangaroo Island's burn scars on January 7.
The bushfires, which started as lightning strikes in Flinders Chase National Park, have resulted in the loss of approximately 25,000 koalas, which is 50 percent of the island's koala population. Overall, more than one billion animals are feared dead in Australia, Chris Dickman, an ecologist at the University of Sydney told CBS News.
Hodgens and Daniella Teixera, an ecologist with the University of Queensland, said the current state on the island is unknown, but some "critical areas" were damaged by the fires, which have killed an estimated half-billion animals.
Almost 20 million acres have burned across Australia in recent months, and authorities say the fires could keep burning for months longer.