Ant Colony Conquers Earth
An Argentine mega-colony of ants has spread from it's home continent of South America to Japan, Europe, and the US. It is the largest known colony of any insect known. Ants from the colony in Japan, when introduced to its relatives from Europe and California, rubbed antennae and behaved as old friends. It should be noted that the spread of the colony is the result of unintentional human interference and assistance.
Story suggested by Anthony M.