The ants we have in the yard making the trails are Thatching Ants, they create mounds and their tunnels can be 2 to 4 feet deep. They have a queen and lotza workers...even different classes of workers....and then the nest sends out more queens to make more nests.
Seems like from what I have read they are hard to kill. The love the Oaks....we must have aphids in the Oaks because many of the leaves are sticky...which provides great food for the ants and you see them crawling up trees. I also read where the bites can blister...hence my stomping of my feet and cussing right out loud when bitten.
I have seen huge mounds in a ditch north of here...we have a huge mound by a power pole along the road...we called the Electric company and told them...I guess they don't care.
Seems there is a shortage of Diatomaceous Earth too... I may have to order it online. One of my readers suggested a mixture of borax and powdered sugar...sounds like a great alternative.
The war will continue. I read there are thousands per nest....