Thank you for responding! I'll check out the link.
No, my yards are small, and the ants were on my front porch. I have a brick planter about 18" tall that runs across the front of the house. Concrete foundation. I have no logs or old wood.
The (good) news is pest control came yesterday and place a whole LOT of bait. I have at least 5-6 different species all over and under my lawns. I was concerned that these might be fire ants because I know sometime their nests are not visible. I have not previously seen this variety before.