For most people ants only become a problem when they enter buildings in search of food and water or when they build their nests in buildings or gardens. Ants can be attracted to a wide range of foods with different species having preferences for sugars, proteins, fats and oils. During extended dry periods they will also search for water. In many species once an individual has found a desirable item it will return to the nest and recruit nest mates to help gather the food. This can result in large numbers of ants rapidly appearing around an item, sometimes with long trails of ants between the nest and the item of interest. Some ants will build nests in walls and foundations, indoor potted plants, and small spaces between fittings and walls. In nearly all cases, the ants are using pre-existing spaces or taking advantage of existing deterioration. Ants generally do not cause structural damage to buildings. Outdoors, nesting can result in soil being deposited on gardens, around pots and between tiles and brickwork resulting in a mess.