Black Ants are one of the most common species globally and are dark brown or black, roughly 3-5mm in length. The queens have two pairs of wings and prefer their nests to be located outdoors in soil, hollowed trees, or under paving slabs. Black worker ants will make their way into your home in search of food and, in extreme cases, can cause structural damage by moving sand in the foundation of your home.
The presence of the ants in large numbers often signal that you have an infestation. They will trail from the outside and set up nests in wall cavities and roof voids.