Two Greater Crested Terns found dead in Dee Why and Warriewood have tested positive for bird flu. The birds were the first known cases of the fast-spreading virus discovered in Sydney, but at the time of publication there were more than 500 confirmed events throughout Australia. Globally, the spread of H5 avian influenza has caused mass mortality in hundreds of millions of wild birds and poultry and has expanded into more than 100 mammal species. It mainly affects birds but can also infect other animals. Cats and dogs can sometimes get sick if they eat or interact with infected animals. To reduce the risk, keep pets away from sick or dead birds and other wildlife. The discovery came just days after the government announced plans to prioritise vaccinating...