When did koalas become endangered?

Koalas are not officially endangered.

Their status varies from "secure" or "common" in many areas to "vulnerable" in localised regions such as southeast Queensland.

Despite urging by conservation groups since around 1992, Australia's federal government has refused to list the koala as vulnerable. Even international conservation groups cannot agree. Meanwhile, the International Union for Conservation of Nature (IUCN) lists the koala as "potentially vulnerable", while the US Endangered Species Act lists the koala as "threatened".