Bangladesh, Jan. 18 -- Australia's unprecedented wildfires season has so far charred 40,000 square miles (104,000 square kilometers) of brushland, rainforests, and national parks - killing by one estimate more than a billion wild animals. Scientists fear some of the island continent's unique and colorful species may not recover. For others, they are trying to throw lifelines.

Where flames have subsided, biologists are starting to look for survivors, hoping they may find enough left of some rare and endangered species to rebuild populations. It's a grim task for a nation that prides itself on its diverse wildlife, including creatures found nowhere else on the planet such as koalas, kangaroos and wallabies.

"I don't think we've seen a sin...