12/02/2009 05:12 am ET Updated Dec 06, 2017

Stress Disease Kills Australia's Iconic Koalas

Experts warn that the number of koala bears in Australia are declining at an alarming rate. With an increasing number of people moving into the animal's natural habitat, the koala is affected by high levels of stress, which brings about diseases like Chlamydia. The disease can cause blindness, infertility and death. Today, fewer than 100,000 koalas are left in Australia, which is down from the millions that once lived there in the late 1700s.