Australia's ecosystems are under threat from one of the world's most invasive species – the red fire ant. The tiny ant is native to South America, but has spread worldwide. It causes huge damage to crops and farms. It also kills indigenous insects and other animals, including livestock. The ant's painful and venomous sting can cause allergic reactions in humans. It is deadly and can cause fatal anaphylactic shock. The Minister for Agriculture called the ants a "super-pest, which cause serious social, economic and environmental harm".

Red fire ants were first found in Australia in 2001. They were only in the state of Queensland, until now. Australia's Invasive Species Council (ISC) says the ants are spreading because of flood waters. They are clinging to each other to create "rafts" on the water. An ISC statement said: "Fire ants are more active before or after rainfall and can form large floating rafts, which move with water currents to establish footholds in new areas." It warned that the fire ants will reach "every corner of Australia" if the current outbreak is not kept in check.