Ants can live in nearly any climate, which makes them one of the most common insects throughout the world. Most species of ants build large nests with intricate networks of tunnels. Ants can create their nests both indoors and out. When building nests outdoors, you may notice small piles of dirt or sand at the entrance. Ants can also live in or around the foundation of your home, or in the walls of your home. Ants prefer to build their nests near sources of food, water and protection from predators and the elements.