Our common ant here in Texas is called the acrobat. Because the fence lines all touch every single house in the neighborhood, it's like a highway system touching every single house at least twice on each side of the house. Acrobat ants often times will use holes in fence posts, often times old dry rot holes. This is a perfect example of how ants here in Texas will thrive inside of a rotting fence post and then migrate out to the various attached houses. We've got ants moving now from the fence that we just looked at, to the tree moving along the limbs of the tree under the rain gutter of the house which often times has a lot of leaves in it decaying organic matter and other materials is great substance for ants to thrive on.
The neat thing about acrobat ants that makes them so difficult to get rid of is they’ll often times climb on limbs across the sprays that pest control companies lay down on your foundation along the limb all the way to some place where the leaf or limb touches the house and they'll set up camp in your gutters, set up entire colonies up in the gutters, up by your roof. You can spray all you want on the foundation. It won't get rid of unless you have a pest control company that knows what to look for.