Red imported fire ants are omninvores, preying on invertebrates and vertebrates and also eating plants and honeydew. They are highly aggressive, with a venomous sting used to kill their prey and defend their nest, and they swarm in large numbers to attack any animal disturbing their nest.
Although they are tiny (2-6 mm), their sting and high numbers enable them to overwhelm and kill prey much larger than they are.
Infestations have been found in Queensland and in 2014, in Sydney. The Queensland government leads a $300m nationally funded attempt to eradicate a 2001 South East Queensland infestation while all other infestations are eradicated or close to eradication.