Pest Control Glossary: Pest Terms Explained in Plain English

Yes. Mice can make scratching, scurrying and gnawing sounds inside walls, ceilings and lofts. Their small size allows them to enter narrow gaps and move through concealed spaces. The CDC confirms that mice can squeeze through openings approximately 6 mm wide.

Yes, mice can pose health and property risks. They can contaminate food and surfaces with urine and droppings, potentially exposing humans to harmful pathogens such as Salmonella. Mice also gnaw through insulation, packaging and electrical wiring, causing damage and potentially increasing fire risks.

Mouse droppings are small, dark and typically shaped like grains of rice, often around 5 mm long. They may be found in cupboards, drawers, behind appliances or along concealed routes. Look for other evidence, such as gnaw marks, to support identification.

A dead mouse can produce a strong, unpleasant smell as its body decomposes. The odour is often described as rotten or musty and may become more noticeable in warm, enclosed spaces such as wall cavities, cupboards or beneath floorboards. The smell alone cannot confirm a dead mouse, as other problems can cause similar odours.

There is no reliable way to calculate the number of mice in a house from a single sighting. One mouse may have entered alone, but repeated droppings, gnaw marks, nesting materials and activity in several rooms can suggest a wider problem. A thorough inspection is needed to establish the extent of an infestation.

Mice enter houses in search of food, warmth, water and shelter. Small gaps around pipes, doors, vents and damaged building materials can provide access. Once inside, mice may nest behind appliances, beneath floors or within wall cavities, particularly where food is readily available and disturbance is limited.

Yes. House mice are primarily nocturnal, meaning they are generally more active at night when there is less disturbance. However, they can also move around during daylight hours, especially in quiet areas or when searching for food. Seeing a mouse during the day does not necessarily indicate a large infestation.

Getting mice out of walls starts with identifying their entry points and confirming where they are active. Scratching sounds, droppings and gnaw marks can help locate movement routes. Professional mouse control may involve carefully positioned traps and proofing work. Entry holes should be sealed once mice have been removed to prevent further activity.

The number of mice in a nest varies depending on the age of the young and whether several mice share the nesting area. A female house mouse commonly gives birth to around five or six pups per litter, although litter sizes vary. Finding one nest does not necessarily reveal how many mice are living throughout the property.

Mice are attracted to readily available food, shelter and suitable nesting spaces. Unsealed food packaging, crumbs, pet food, accessible rubbish and cluttered storage areas can make a property appealing. They can enter through very small gaps, so removing attractants and sealing access points are both important for prevention.

House mice are omnivores and eat a wide variety of foods, including grains, seeds, cereals, fruit and insects. Indoors, they may feed on stored food, crumbs and pet food. Although commonly associated with cheese, mice are not particularly dependent on it and will exploit whichever accessible foods are available.

The most reliable approach is to remove food sources, reduce hiding places and seal gaps that allow mice indoors. Ultrasonic devices, peppermint oil and other household repellents have limited evidence of providing lasting control. If mice are already established inside a building, repellents alone are unlikely to resolve the infestation.

Mice can enter through gaps around pipes, doors, air bricks, vents and damaged building materials. Their flexible bodies allow them to squeeze through openings approximately the width of a pencil. Checking external walls, utility connections and ground-level gaps can help identify where mice are gaining access.

Mice may appear suddenly when changes in weather, nearby building work or reduced outdoor food supplies encourage them to seek shelter. However, the infestation may have been developing unnoticed for some time. Finding new droppings, hearing scratching or seeing a mouse can simply be the first visible sign of existing activity.

Bed bug droppings usually appear as tiny dark spots or stains on mattresses, bed frames and nearby surfaces. Unlike rodent droppings, they are generally seen as marks rather than separate pellets. Look for shed skins, eggs or live bed bugs to help confirm the cause.

Adult bed bugs are typically around 4–7 mm long, roughly the size of an apple seed. They have flat, oval bodies and are usually reddish-brown. After feeding, their bodies become more swollen and elongated. Young bed bugs, known as nymphs, are considerably smaller and often pale or translucent, making them harder to spot.

There is no single household product guaranteed to eliminate every bed bug infestation. Effective treatment usually requires a combination of thorough inspection, targeted insecticide application or professional heat treatment, and follow-up checks. Bed bug eggs and insects hiding in cracks can survive incomplete treatment, so repeated assessment is often necessary.

Silverfish may hide beneath carpets, along skirting boards and in gaps around flooring, particularly where conditions are damp and undisturbed. They feed on starches and other organic materials, including certain adhesives, paper and textile fibres. Repeated sightings near carpets may indicate excess moisture or suitable hiding places beneath the flooring.

False widow spiders belong to the genus Steatoda and are named for their resemblance to black widow spiders. Several species occur in the UK, including the noble false widow (Steatoda nobilis). They use venom to capture prey but generally pose little danger to humans, with serious reactions to bites being uncommon.

False widow spiders typically have rounded, shiny abdomens and brown to black colouring. The noble false widow (Steatoda nobilis) often has distinctive cream-coloured markings on its abdomen and reddish-brown legs. Adult females can reach approximately 14 mm in body length, excluding legs, although appearance varies between species.

Yes, several spider species in the UK are venomous, including false widow spiders. Most spiders use venom to subdue prey, but few can bite through human skin or cause significant symptoms. Serious reactions to spider bites are uncommon in the UK, and spiders generally bite only when threatened or trapped.

UK spiders are generally venomous rather than poisonous. Venom is injected through a bite, whereas poison is harmful when swallowed or absorbed. Some UK spiders, including false widows, can bite humans, but serious effects are rare. There are no native UK spiders considered highly dangerous to healthy adults.

False widow spiders can deliver a venomous bite, but serious reactions are rare. Bites usually occur when a spider is trapped against the skin or feels threatened. Symptoms typically include localised pain and sometimes swelling, often comparable to a wasp sting. False widows are not considered aggressive towards humans.

A false widow bite may cause immediate localised pain, redness or swelling, with symptoms usually improving within 24 hours. Wash the area with soap and water and apply a cool compress. Seek medical advice if symptoms worsen, persist or show signs of infection.

Tiny spiders indoors may be young spiderlings that have recently hatched or adults of naturally small species. Spiderlings sometimes disperse in large numbers after leaving an egg sac, making them suddenly noticeable around ceilings, windows and corners. Most are harmless and will disperse naturally, although some may remain where insects are available.

Spiders do not deliberately seek out beds or sleeping people. They may occasionally wander across bedding while searching for prey, shelter or a mate. Bedrooms can provide entry points around windows, skirting boards and furniture. Finding a spider in your bed does not necessarily indicate an infestation or mean that spiders are nesting in the mattress.

Yes, some ants in the UK can bite humans, particularly when disturbed or defending their nests. Black garden ants may bite, while red ants can both bite and sting. Reactions are usually mild, causing temporary pain, itching or skin irritation, although some people may experience stronger reactions.

Black garden ants (Lasius niger) are small, dark brown or black ants, usually measuring 3–5 mm. They commonly nest outdoors in soil, lawns and beneath paving. Worker ants may enter homes through small gaps while searching for food, particularly sugary substances.

Red ants in the UK include Myrmica rubra, a reddish-brown garden ant that can sting when disturbed. They generally live outdoors in gardens and other vegetated areas rather than regularly invading houses. Their presence does not automatically indicate a household infestation.

Carpenter ants belong to the genus Camponotus and are known for nesting in wood. They are not among the common ants infesting UK homes. Some Camponotus species have been recorded in Britain, including introduced specimens, but finding ants near timber does not automatically mean carpenter ants are present.

The UK has around 60 ant species, but only a few regularly cause problems in buildings. Common types include black garden ants, red ants and Pharaoh ants. Black garden ants are frequently found around homes, while Pharaoh ants are more associated with warm indoor environments.

Flying ants in the UK usually emerge between June and September, with activity often peaking in July and August. They swarm during warm, humid weather, when winged males and queens leave their colonies to mate. The timing varies with local weather conditions.

Flying ants are winged reproductive ants, known as alates. They are young queens and males that leave established colonies to mate. In UK towns and gardens, most flying ants seen during summer swarms belong to the black garden ant species (Lasius niger).

Flying Ant Day describes the summer period when large numbers of winged ants emerge from their nests to mate. Despite its name, there is no single nationwide flying ant day. Swarms occur across several weeks, with different locations experiencing activity at different times.

Flying ants are common throughout the UK, particularly in gardens, parks and residential areas during summer. Most sightings involve winged black garden ants (Lasius niger), which emerge from established colonies to mate. Their appearance is a natural seasonal event and does not necessarily indicate an infestation inside your home.

Flying ants suddenly appear when warm, calm weather triggers large numbers of reproductive ants to leave their nests together. This coordinated flight increases their chances of finding mates. The Met Office has even detected exceptionally large UK swarms on weather radar.

Flying ants can bite or sting depending on their species, but the common black garden ants responsible for most UK summer swarms are generally harmless to people. Some red ant species can sting when disturbed. Flying ants emerge primarily to mate, not to attack humans.

Ants may enter bathrooms in search of moisture, particularly during dry or warm weather. Leaking pipes, condensation and damp areas around sinks or baths can attract them. Small gaps around plumbing, tiles and skirting boards may provide entry points. Repeated sightings can indicate a nearby colony or a consistent route to water.

Gardens provide ants with food, shelter and suitable nesting conditions. Colonies often establish themselves beneath paving slabs, stones, lawns and flowerbeds. Ants may gather around plants where aphids produce honeydew, a sugary substance they feed on. Large numbers of ants outdoors are usually part of normal garden activity rather than evidence of an infestation.

Clothes moths are generally more active during warmer months, particularly spring and summer, but can breed year-round inside heated UK homes. Outdoor moth species follow different seasonal patterns, so there is no single moth season across the UK.

Pantry moths are small moths whose larvae infest stored dry foods, including cereals, flour, nuts, seeds and dried fruit. The Indian meal moth (Plodia interpunctella) is a common example in UK homes. Unlike clothes moths, pantry moths feed on stored food products rather than fabrics.

Indian meal moths are small, with a wingspan of approximately 10–15 mm. Their forewings have pale bases and darker, purplish-brown outer sections. Their larvae are pale, caterpillar-like insects with brownish heads. Silky webbing among stored food is often a more reliable infestation sign than adult moth sightings alone.

Pantry moth infestations often begin when eggs or larvae enter the home inside infested dry food products. Once established, larvae feed and develop in stored cereals, grains, nuts and other dried foods. Infestations can occur even in clean kitchens because contaminated products may already contain hidden insects.

Common signs include small moths flying around cupboards, pale larvae in dry foods, silky webbing and clumped or damaged food products. Eggs and developing larvae can be difficult to see, so removing visible adult moths alone may not eliminate an infestation.

Pantry moths are not generally considered a significant direct health risk, but their larvae can contaminate stored food with webbing and insect material, making affected products unsuitable for consumption. Food showing signs of infestation should be discarded rather than eaten.

To get rid of pantry moths, identify and discard infested food, inspect nearby dry goods and thoroughly clean cupboard shelves, corners and crevices. Store replacement foods in tightly sealed containers and monitor for further moth activity. Removing the contaminated food source is essential because killing adult moths alone will not eliminate developing larvae.

A moth is an insect belonging to the order Lepidoptera, which also includes butterflies. Most moths have wings covered in tiny scales and undergo four life stages: egg, larva, pupa and adult. While some species damage clothing or stored food, most are harmless and play important roles in natural ecosystems.

A moth's lifespan varies considerably depending on its species and environment. Some adult moths survive for only a few days, while others live for several weeks or longer. The complete life cycle, including the egg, caterpillar and pupal stages, can take months. Temperature and food availability influence development.

The term red moth does not describe a single species. Several British moths have reddish, orange or pink markings, including the ruby tiger moth and elephant hawk-moth. Their appearance, size and wing patterns help distinguish them. Finding a brightly coloured moth indoors does not automatically indicate a household pest infestation.

Silk moths are members of a group of moths whose caterpillars produce silk. The domesticated silkworm moth, Bombyx mori, is particularly well known for producing silk used in textiles. Other species also spin silk cocoons. Silk moths are different from the clothes moths responsible for damaging wool, carpets and other natural fibres.

Ordinary household moths in the UK cannot kill you in your sleep. Adult clothes moths and carpet moths do not bite, sting or feed on human blood. Their main concern is damage caused by larvae feeding on natural fibres. Some moth caterpillars can cause skin irritation, but this is different from the moths commonly found in bedrooms.

Moths are important pollinators, particularly for flowers that open or release scent at night. They also provide food for bats, birds and other wildlife. Their caterpillars support many food chains and feed on a wide range of plants. Although a few species become household pests, moths are essential contributors to biodiversity.

Traditional mothballs contain insecticidal chemicals that can affect clothes moths when used correctly in tightly enclosed storage spaces. However, they are not a reliable solution for an established infestation throughout a room and can pose health risks if misused. Regular cleaning, inspecting fabrics and appropriate treatment are safer starting points.

Moth larvae are small, caterpillar-like insects, usually cream or off-white with darker heads. Clothes moth larvae are often around 10 mm long when fully grown and may hide inside silken tubes or webbing. Carpet moth larvae can look similar. Unlike adult moths, these feeding larvae are responsible for damage to wool, carpets and other animal-based fibres.

A wasp sting injects venom into the skin, usually causing immediate sharp pain, redness and swelling around the sting site. Most reactions improve within a few days, although some people develop more extensive swelling. Severe allergic reactions can cause breathing difficulties or swelling of the throat and require immediate emergency treatment.

Wasps can both bite and sting, but they primarily use their sting to defend themselves against humans. A wasp sting injects venom into the skin, causing immediate pain, redness and swelling. Unlike honeybees, wasps can usually sting multiple times without losing their stinger.

If wasps are repeatedly entering a gap in brickwork, cladding or around a window frame, there may be a nest inside the wall cavity. Avoid blocking the entrance or disturbing the surrounding structure, as this can cause wasps to emerge indoors. A professional inspection can locate the nest and determine the safest treatment.

Birds build nests in different locations depending on their species. Garden birds may nest in trees, hedges, shrubs, cavities or nest boxes, while pigeons and gulls often use sheltered ledges and rooftops. Nests provide a place to lay eggs and raise chicks. In the UK, active wild bird nests are generally protected by law.

Bird diets vary considerably by species. Some feed mainly on seeds, grains and berries, while others eat insects, worms, fish or small animals. Pigeons commonly consume seeds and grains, whereas gulls are opportunistic feeders. Food availability can influence where birds gather, particularly around gardens, buildings and urban areas.

Yes, several garden bird species, including sparrows, finches and pigeons, may eat freshly scattered grass seed. Newly seeded lawns can attract feeding birds, especially where seeds remain visible on the soil surface. Lightly raking seeds into the soil or using suitable temporary protective netting can help reduce losses without harming wildlife.

Most birds sleep in sheltered places that offer protection from predators and bad weather. Depending on the species, they may roost in trees, dense hedges, cavities, roof spaces or communal roosting sites. Birds do not necessarily sleep in nests, which are primarily used for breeding and raising young.

A bird's lifespan depends on its species, environment and exposure to predators, disease and other hazards. Many small garden birds survive only a few years in the wild, although some individuals live considerably longer. Larger birds, including gulls, can survive for decades under favourable conditions.

The main bird nesting season in the UK generally runs from March to August, although some species nest outside these months. Before cutting a hedge, check carefully for active nests. Under the Wildlife and Countryside Act 1981, intentionally damaging or destroying an active wild bird nest is generally an offence. If a nest is active, postpone the work until it is no longer in use.

Most wild birds in the UK are protected under the Wildlife and Countryside Act 1981. Certain species may be controlled under specific licences and conditions, including circumstances involving public health, safety or serious damage. The rules vary across the UK's nations, and a bird being considered a pest does not automatically make shooting it lawful.

Moles create networks of tunnels at different depths depending on soil conditions, moisture and food availability. Shallow feeding tunnels may lie just a few centimetres beneath the surface, while deeper permanent tunnels can extend 30–60 cm underground or more. Their digging produces the distinctive molehills commonly seen on lawns.

Moles live mainly underground in grasslands, gardens, parks, woodland and agricultural fields. They prefer soil containing plenty of earthworms and other invertebrates. Their tunnel systems provide routes for feeding, shelter and nesting. Although molehills reveal their presence, moles themselves are rarely seen above ground.

Moles are generally solitary and territorial animals. Adults usually occupy their own tunnel systems and avoid other moles except during the breeding season. A single mole can create numerous molehills across a garden, so several mounds do not necessarily mean multiple moles are present.

Moles are insectivorous mammals that feed primarily on earthworms, alongside insect larvae and other small soil-dwelling invertebrates. Contrary to a common misconception, they do not normally eat plant roots or garden vegetables. However, their tunnelling can disturb roots and loosen surrounding soil, occasionally damaging lawns and plants indirectly.

Moles can bite if caught, handled or threatened, but they rarely come into contact with people because they spend most of their lives underground. Their sharp teeth are adapted for eating invertebrates rather than attacking humans. Avoid handling wild moles, and seek medical advice if a bite breaks the skin.