I believe these tiny black ants are a species extremely common in this location, with nests involving millions. They have no hesitation in nipping/stinging you if they climb on you and they are quite invasive to human habitat, especially in the days leading up to a rain event. Once established, however, they remain there. Only in closeup, and at certain angles, are 2 feint white lateral bands across the abdomen visible on this sightings subject (photos 1, 3 & 4). If these are the ones I’m thinking of, they are the same species as at sighting 4664475, and inclined to stick their abdomens up in the air at a roughly 45 degree angle. That was not observed on this occasion. The background is a relatively new concrete path.
Hi MazzV, many species of Iridomyrmex are as you describe - large nests with thousands or tens of thousands of ants, and very happy to defend their space with plenty of bites (they don't have a sting - some ants have stings and some don't - Iridomyrmex don't). Cheers.
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