Ants 

Ants are members of the family Formicidae within the order Hymenoptera, the insect group that also includes bees and wasps. Australia is home to approximately 3,000 known ant species, making them one of the most diverse and widespread insect groups in the country. Ants are highly organised social insects that live in structured colonies, usually within permanent nests. Nesting sites vary by species and may occur in soil, wall cavities, roof voids, timber, under rocks or within garden beds. Colony sizes range from a few hundred individual to many thousands, depending on the species. Unlike many other insects, ants are adapted to feed primarily on liquids. Solid food particles are often carried back to the nest and processed with moisture and saliva before being consumed or shared among colony members. This behaviour allows them to exploit a wide range of food sources in and around buildings. Because of their adaptability, ants are among the most commonly encountered insects in residential and commercial environments. They are frequently seen along foundations, inside wall cavities, in kitchens and pantries, within lawns and gardens, and in decaying timber. As a group, ants are regarded as one of the most evolutionary successful insect families due to their complex social systems, cooperative behaviour, and ability to thrive in varied environments.

Ants have a clearly segmented body divided into three main sections: the head, thorax and abdomen. One of the most distinctive features is a narrow "waist" between the thorax and abdomen. This waist is formed by one or two small segments called the pedicel, which may appear as raised bumps or nodes. The number of shape of these nodes are important characteristics used to distinguish between different ant species. The head contains a pair of compound eyes and a set of elbowed (bent) antennae, which are a key identifying feature separating ants from termites. Some species also possess small simple eyes (ocelli) although these are not always obvious. Most worker ants are wingless. However, reproductive males and queens develop wings during the breeding season. When present, the wings are clear and membranous, with the front pair noticeably longer and broader than the hind pair. After mating, queens typically shed their wings before establishing a new colony. These structural characteristics; particularly the narrow waist, elbowed antennae, and body segmentation; help differentiate ants from other common insects found in and around buildings.

Metamorphosis Ants undergo complete metamorphosis, developing through four distinct life stages: egg, larva, pupa and adult. Eggs are small and oval in shape. The larva that hatches is a soft, legless, whitish grub that relies entirely on adult workers for feeding and care. After several moults, the larva enters the pupal stage, a transition phase during which it develops into an adult. Pupae are typically creamy-white and inactive; in some species they are enclosed within a silk cocoon. Once development is complete, the adult ant emerges and gradually hardens and darkens over several hours or days. The time required for development from egg to adult varies widely depending on species, temperature, food availability and environmental conditions, and may range from approximately six weeks to several months. Castes Ant colonies are organised into three distinct castes: Male Ants: Males adults are winged and are produced for the sole purpose of reproduction. After mating, males usually die shortly thereafter. Queens (Reproductive Females): The queen is typically the largest member of the colony. She begins adult life with wings and participates in a mating flight, after which she sheds her wings and establishes or joins a nest. In many species, a colony has a single queen, while others may contain multiple reproductive females. Once mated, a queen can lay fertilised eggs for many years and may live for over a decade under favourable conditions. Workers: Workers are sterile, wingless females and form the majority of the colony. They are responsible for foraging, nest construction and maintenance, caring for eggs and larvae, defending the colony, and feeding other castes. In some species, workers vary in size, with larger individuals sometimes referred to as soldiers. Worker lifespan is generally around one year, although this can vary. Reproduction Reproduction typically involves a seasonal mating flight, during which winged males and females swarm and mate in the air. Fertilised queens then shed their wings and seek a suitable nesting site to establish a new colony. Unfertilised eggs develop into males, while fertilised eggs develop into females (workers or future queens). Not all species rely on large swarming flights. Some ants mate within or near the original nest. In certain species, new colonies are formed by a process known as budding, where one or more queen/s leave a parent nest accompanied by a group of workers to establish a nearby colony. This behaviour can allow infestations to spread gradually through wall cavities, garden beds and neighbouring properties, particularly in species that maintain multiple interconnected nests.

Most ant species establish permanent or semi-permanent nests, although relocation can occur if environmental conditions change or the colony is disturbed. Nests are commonly constructed in soil, beneath paving, within wall cavities, roof voids, decaying timber, garden beds or under rocks. Some species form extensive underground tunnel systems, while others create interconnected satellite nests spread across a property. Worker ants leave the nest to forage for food and water. Once a reliable food source is located, workers often establish clearly defined foraging trails between the nest and the resources. These trails are typically maintained using chemical signals known as pheromones. Trail-marking pheromones allow other workers to follow the same path efficiently. In addition to chemical communication, ants use a combination of sensory cues including touch (via their antennae), taste ( through food exchange), vibration, and in some species, vision.

Ants are commonly regarded as nuisance pests when they establish nests close to homes or begin foraging inside buildings. Their presence is often noticed when worker ants form visible trails across floors, walls, benches, or around entry points such as windows, doors and foundations. These trails occur when ants locate a reliable food source and recruit other workers from the colony using chemical scent markers. Outdoors, ants may build small soil mounds or excavate material from beneath paving, paths, garden edging and building foundations. These excavations can create unsightly areas in lawns, garden beds and along pathways, and in some cases may contribute to minor movement or cracking in older paved surfaces. Around homes, ants may also nest in wall cavities, roof voids or under flooring, where they remain largely hidden but continue to forage inside the building. In gardens, some species may disturb soil around seedlings or consume seeds, which can affect newly planted plants. Ants are also commonly associated with plant-sucking insects such as aphids and scale insects. By feeding on the sugary honeydew produced by these insects, ants may protect them from natural predators, which can allow plant pest populations to increase. Ants can also present hygiene concerns in food preparation and storage areas. As scavengers, they frequently move between outdoor environments, waste areas, and indoor food sources. During this process they may carry bacteria or other microorganisms on their bodies or within their digestive systems. While ants are not primary disease carriers, their movement through kitchens, pantries, rubbish areas and other contaminated locations means they have the potential to spread unwanted microbes onto food or food-contact surfaces. Some ant species are also capable of biting or stinging when disturbed. Although most bites or stings cause only minor irritation, they can be uncomfortable and may be more serious for individuals with sensitivities or allergies. For these reasons, ants are widely considered pests when they invade homes, gardens or commercial premises.

Effective ant management relies on understanding the species involved, where the ants are nesting, where they are feeding and the routes they use to travel between these areas. Worker ants often establish defined trails between their nest and food or water sources. Following these trails can help identify the approximate location of a colony and determine the most appropriate management approach. Because nesting and feeding behaviour varies between ant species, successful management may require a combination of professional pest management and environmental measures that reduce food, water, harbourage and access around the property. PROFESSIONAL PEST MANAGEMENT Professional ant management begins with an inspection of the property to identify ant activity, foraging trails, potential food sources and, where possible, nesting locations. Where a nest can be located and accessed, direct treatment of the nesting area may provide effective longer-term management. Where the nest cannot be accessed directly, other approaches may be used to target ant activity and the routes between nesting and feeding areas. Depending on the ant species, location of the colony and conditions found at the property, professional management may include targeted treatments to nesting or harbourage areas, residual treatments, dusts, foams, baits or other appropriate pest-management methods. Baiting can be particularly useful where nests are difficult to locate or access. Worker ants collect suitable bait while foraging and carry it back towards the colony. Different ant species and colonies may have different feeding preferences, so bait selection and placement can be important to successful management. Ant colonies may also occur in more than one location or extend beyond the immediate area where ants are being seen. For this reason, effective management depends on identifying the source and extent of the activity rather than treating only the visible ants. PREVENTION & NON-CHEMICAL RISK MANAGEMENT Good sanitation and environmental management can help reduce conditions that encourage ants to forage or establish activity around homes and buildings. Indoors, kitchen benches, cupboards, drawers, floors, tables and appliances should be kept as free as practical from crumbs, grease, spills and other food residues. Food should be stored in sealed containers, and dishes and utensils should be cleaned after use rather than left for extended periods. Rubbish bins should be kept reasonably clean and closed, spills should be cleaned promptly, and pet feeding areas should be kept clean. Where practical, pet food should not be left available for long periods when pets are not feeding. Outside, food residues around entertaining areas, rubbish storage areas and pet feeding locations should be removed. Drink containers and other food packaging should be rinsed or appropriately contained before disposal. Garden plants should also be monitored for sap-sucking insects such as aphids and scale insects. These insects produce honeydew that can provide a valuable food source for ants and encourage ongoing ant activity around vegetation. Where practical, cracks, gaps and potential entry points around doors, windows, walls, foundations and service penetrations can be sealed. Reducing unnecessary debris, decaying timber and other potential nesting or harbourage areas close to buildings may also help reduce ant activity. These measures do not necessarily eliminate established colonies, but they can make the environment less favourable to ants and form an important part of longer-term ant risk management.