Around 480 million animals are feared to have died in the bush fires sweeping Australia.
Its thought nearly a third of the koalas in New South Wales's main habitat are now gone.
Ecologists at the University of Sydney estimate the huge number of mammals, birds and reptiles have been killed, directly or indirectly, by the devastating blazes since they began in September.
This includes almost 8,000 koalas, which are believed to have burnt to death on the state’s mid-north coast.
The region, which lies around 240 miles north of Sydney, is home to the largest number of Australia’s koalas, with a population of up to 28,000.
Federal environment minister Sussan Ley says "up to 30 per cent of the population in that region" may have been killed, because around 30 per cent of their habitat has been destroyed.