WARNING - distressing content.

Fleeing for its life, this tiny kangaroo joey had nowhere left to run.

As a ferocious blaze tore through Cudlee Creek in the Adelaide Hills, the roo became trapped in a wire fence as flames closed in.

He didn't stand a chance.

Publishing distressing photos like this is a difficult decision but, tragically, this is the brutal reality of Australia's bushfire crisis.

In South Australia's Cudlee Creek fires alone, 5,790 animals - including livestock, alpacas and pets - have been killed.

It's believed up to 500 million animals have perished across Australia as the true cost of the fire emergency begins to reveal itself.

Devastated farmers are being told to photograph their dead and injured livestock for insurance claims, with landowners having to euthanise many heat-stressed and burned animals which survived the blazes.

A Koala saved from the bushfires in Gippsland is cared for at the Southern Ash Wildlife Centre in Melbourne's south-east. Credit: Andrew Brownbill / AAP

An injured brushtail possum suffering burns to its paws, nose, ears and tail. Credit: Mattias Engesser / AAP

Drought-devastated farmers are being forced to euthanise badly burnt livestock. Credit: Kelly Barnes / AAP

In coming days, more animals will die from starvation and heat stress as they battle to find food and shelter in their decimated habitat.

Wildlife rescue groups say the task is "largely a job of euthanising".

More bushfire coverage on 7NEWS.com.au

"They are so severely burned that there is nothing better you can do than end their suffering," Wildlife Victoria boss Megan Davidson said.

Native wildlife and agricultural livestock are among the fatalities, with already-endangered species at greater risk of extinction.

The extent of the carnage may never be known.

- With AAP

Many have been asking how you can help the people and animals affected by the bushfire crisis. We’ve launched the ‘HELP HERE’ page to make that easier for you.

In the video below: Fire taskforce launches in wake of destruction