The bacterium Chlamydia psittaci is thought to be the main cause of disease and scientists are cosntantly investigating its effects on koala populations. It appears that koalas in crowded conditions, or where food supply has been depleted, are more likely to be diseased. Research is continuing on methods of treatment and rehabilitation of koalas suffering from infection or injury. Adults and young can fall prey to dingoes, while moving along the ground from tree to tree. Young koalas are occasionally taken by goannas, wedge-tailed eagles and powerful owls.
Koalas suffer now from loss of habitat, problems with roads and traffic.
Feral cats and dogs, also foxes.