Koala bears eat only an eucalypt diet, which has limited nutritional content. So koalas are largely sedentary and sleep up to 20 hours a day. Being marsupials, koalas give birth to underdeveloped young that crawl into their mothers’ pouches, where they stay for the first six months of their lives. These young koalas, known as joeys, are fully weaned around a year old. Koalas have few natural predators, but are threatened by various pathogens, as well as by fires and droughts. Because of its distinctive appearance, the koala is recognised worldwide as a symbol of Australia. Koalas are listed as vulnerable. The Australian government similarly lists specific populations in Queensland and New South Wales as Vulnerable. Koalas were hunted heavily in the early 20th century for its fur, and large-scale cullins in Queensland resulted in a public outcry that initiated a movement to protect the species. Sanctuaries were established since the biggest threat to their existence is destruction of their habitat by man.