It’s been a year where invasion metaphors have, well, invaded our lives. There’s been the global spread of Covid-19, for example, which has often been compared to an enemy force taking over the world country by country. Then there was the brief terror in the US over the invasion of murder hornets. But did you know that there was already an invasive species we found new facts out about this year, one which numbers in the billions and has already taken over six continents? No, not humans, but Argentine ants.