A survey shows that Koala populations are bouncing back in areas between Morton and Bungonia that were hit hard during the Black Summer bushfires .

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Nearly 5,000 male koala bellows across more than 4,000 hectares stretching from Marulan to Kangaroo Valley were recorded in the survey.

Tiny box-shaped recorders strapped to trees captured the sounds of the bush day and night for two weeks during the breeding season, with calls audible up to 200 metres away.

The distinctive "snore-like" bellows were analysed using artificial intelligence.

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