well, i believe they're using the term "megacolony" in reference to the fact that ants from different colonies are usually aggressive to ants from other colonie

well, i believe they're using the term "megacolony" in reference to the fact that ants from different colonies are usually aggressive to ants from other colonies. but in this case, several giant colonies from different continents aren't aggressive towards one another and are genetically linked, so they're referring to the group of familial and non-aggressive colonies as a megacolony.