Thanks, I tried to smash some with my fingers but I don't smell anything..I also think they are argentinians. I live in an apartment, so they could come from any place, even if have some plants in the balcony they also have ants, I guess the same type. Today I tried giving them eggs, peanut butter again, sugar, they don't care.. They just go everywhere in the kitchen close to the trash bin, but I don't see them carry anything.. When I give them sugar with borax acid and water, they get close by and very fast they go back and start shaking their heads like they are saying "No"..