While some wildlife managed to survive the Adelaide Hills bushfire, many animals have been badly burnt and left in need of food and water.

The fire north-east of Adelaide has burnt more than 12,000 hectares since it started on Friday and animal welfare teams are expecting a low survival rate because of its intensity.

Farmers have begun euthanasing livestock injured by the blaze and the South Australian Veterinary Emergency Management (SAVEM) entered the area on Monday.

Firefighters and RSPCA workers are doing the best they can to help the wildlife that survived the fierce blaze.

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While covering the story, ABC reporter Candice Marcus came across an injured koala on the roadside at Chain of Ponds.

"There are firefighters who've also pulled up here, trying to help a koala that's been quite badly injured in the bushfires," she said.

"The koala seems very weak. It's not moving very much, it's currently resting in the shade on the side of the road.

"The firefighters are trying to give the koala some water which it's now starting to drink but they've called some vets who are on the way here, but the koala doesn't seem to be in a very good way."

NSW firefighter Sam Judd said he would not leave the animal's side until vets arrived.

"It's not a good thing to see at all but what do you do?" he said.

"It's hot weather and if they're injured when we find them, we've got the numbers of people that can come up and take care of them because it's heartbreaking really to see a thing like that."

The RSPCA said inspectors had been forced to put down animals that have been badly burnt.

"There's areas that we haven't been able to get into and we're just seeing animals at the fringes of some of the forests looking for water and food," Chief Inspector Andrea Lewis said.

"These animals have had no food, no water and that will be ongoing for a significant period of time."

Another koala, nicknamed Jeremy, was received by the Australian Marine, Wildlife Research and Rescue Organisation and is recovering well.