Australian authorities have declared a state of emergency across large parts of the east coast, over what they're calling "catastrophic" wildfires. They urged residents in high risk areas to evacuate. It is the first time that the Sydney region has been given such a strong warning in 10 years. The fires have also had a devastating impact on wildlife. About 350 koalas were feared dead in a major habitat. Rescue services have been moving large animals from high risk areas.