Ants could have a $2bn per year-impact on Australia’s economy, researchers say Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice A fire ant nest has been spotted at one of Australia’s most iconic World Heritage rainforests, sparking concerns about the potential threat