Ants have a mass of 3mg, so 2 million ants is about 6kg. For perspective.
Given that ants make 20% of the entire animal biomass on land (https://www.youtube.com/watch?v=7_e0CA_nhaE), it didn't cross my mind that subspecies could go to extinction ^^
Meanwhile a cube of side 1 mm has a volume of 1 mm^3.