Biology:
Ants are one of the most successful groups of insects. They are social insects that live in colonies, which are usually located in the ground, but may enter buildings for shelter and or/food.
They feed on practically on any food, but those entering homes are looking for sweets and/or protein containing substances.

Ants are usually divided into two groups based on their typical nesting preferences, either wall nesting or ground nesting ants. The biology and habits of each species are different.
The most common wall nesting ant that we will deal with are the pharaoh ant and the most commonly nesting ground ants are the common black ants.

Habits:
Their life is mainly spent outside in the soil and under paving slabs etc. but because of the foraging for food they enter indoors and become a problem. As they forage for food they leave scent trails for the other ants to follow which is why you long lines of ants. They are a very social insect that is the reason you see them in large numbers.

Reasons for Control:
Loss of goods and quality, loss of goodwill, prevention of damage, prevention of contamination.