Volunteers from Bendigo's Wildlife Rescue and Information Network and Department of Environment and Primary Industries officials are working in Rosalind Park to rehabilitate an "alarming" number of flying foxes. 

The department's senior compliance officer Brady Childs said the flying foxes were not acclimatised to the prolonged period of heat.

"Trained and experienced carers will remove heat stressed and injured flying foxes, which will then be placed with trained wildlife rehabilitators," he said.

Eureka Wildlife Shelter operator Stephen Boyes is committed to getting these flying foxes back to their original health. 

"Instead of releasing them slowly we'll do a mass release.

"They're social animals and they interact well together so they have a better chance if we release them altogether," he said.

WRIN volunteer Michelle Mead is disappointed that the flying foxes are such misunderstood animals.

"We pick them up and care for them, give them fluids so they can be released again when they are better," she said.