Tiny black, gnat like bugs infesting concrete walls outside
I am wondering if anyone else is seeing these little black bugs in their yards? They are tiny, black gnat like bugs but they crawl fast especially in the sunlight, they actually act like ants. They don't seem to fly. They are covering the concrete walls and rocks outside, but not really near the plants as far as I can see. Any ideas on what they might be? Sorry, too tiny to take a picture yet.