Wildlife hospitals and care groups are "overwhelmed" with the influx of injured animals caught in the path of the state's bushfires, with average daily koala numbers tripling.

RSPCA Queensland veterinarian Meaghan Barrow said the busiest period would come now the bushfire crisis had eased and wildlife carers were able to get into the scorched bushland.

Ms Barrow said there were 12 injured koalas brought into the RSPCA Queensland’s Wacol hospital on Sunday, compared to the usual daily average of three or four, although many of the koala’s brought in during the bushfire crisis were “too far gone” to be saved.