GLENMORE PARK (New South Wales) • When Ms Sarah Price found a baby kangaroo frightened but miraculously alive in the pouch of its dying mother surrounded by the embers of Australia's bush fires, it seemed fitting to name him Chance.
The furry pair had survived flames that have ripped through much of south-eastern Australia, but the mother's organs later collapsed from acute stress - making it one of more than one billion animals estimated to have died in the crisis so far.
Chance is slowly recovering, getting regular food and water and hiding out in a bag in a darkened room - a rare success story amid a disaster that has shocked even volunteers accustomed to the country's frequent bush fires and prolonged droughts.
"We are not seeing the number of animals coming into care or needing rescuing that we would normally anticipate," said Ms Price, from wildlife rescue group WIRES. "We think a lot perished in the fires."
Haunting images of koalas with singed fur, possums with burnt paws or countless charred kangaroo carcasses have flashed around the world and have come to symbolise a nation and an environment buckling under the weight of a crisis fuelled by climate change.
The populations of less visible creatures - such as frogs, insects, invertebrates and reptiles - are also expected to have been devastated.
Experts warn that even those animals that survive face a perilous fight to stay alive.
"A lot of the animals die after the fire because they have a lack of food and shelter," said University of Sydney's Associate Professor Mathew Crowther.
In Victoria state, where the fire season is still in its early stages, veterinary surgeons said they have come across koalas, birds, wallabies and possums suffering from not just burns, but also respiratory problems.
"Many are having to be humanely euthanised, but some are able to be saved, with a handful being returned to the remaining habitat," a spokesman for Zoos Victoria said.
Australia's extinction rate for mammals is already the highest in the world, but there are growing fears that this year's bush fires could cause localised extinctions.
One-third of Kangaroo Island, a wildlife haven off the coast of South Australia state, has been razed and there are fears some species unique to the area might have been wiped out.
"There's almost no considerable habitat remaining for many species. That leads to local extinction events," Professor John Woinarski of the Threatened Species Recovery Hub told national broadcaster ABC, describing the fires as a "holocaust of destruction" for wildlife.
At least half of Australia's only infection-free koala population on Kangaroo Island, a key "insurance population" for the species' future, is feared dead.
The Kangaroo Island dunnart, already one of 10 priority threatened mammal species targeted in the national government's Threatened Species Strategy, could face extinction.
University of Sydney's Professor Chris Dickman said his estimate of more than one billion animals killed was "highly conservative", adding: "We're probably looking at what climate change may look like for other parts of the world in the first stages in Australia at the moment."