Spider Species in the UK

False Widow spiders will only bite in defence, when feeling threatened, however bites are fairly rare in the UK. These spiders are mostly nocturnal, rarely venturing out during the day, and they prefer to stay hidden in cracks or crevices close to their webs. Generally, they are solitary creatures that seek out dry, warm environments where they are unlikely to be disturbed. In homes, you might find them in quiet spots such as behind furniture, in sheds, garages, or conservatories. Although their appearance can cause concern, it is important to know that false widow spiders do not actively seek out people, and the risk of bites remains very low. Since they help control other insects indoors, spotting a false widow doesn’t usually mean your home is at risk.

Wolf spiders hunt at night but spend the day hidden amongst moss and decaying matter. They are ground-dwelling predators that do not spin webs to catch their prey, instead relying on their speed and stealth to ambush insects. In the UK, wolf spiders are often seen in gardens, grassy areas, and occasionally indoors, especially if they are searching for food. Their camouflaged brown or grey colouring helps them blend into their environment, making them difficult to spot during the day. Although their sudden appearance may startle you, wolf spiders are not considered dangerous to people or pets.

Harvestman can usually be found in fields and forests. Despite their spider-like appearance, they are more distantly related and belong to a different order called Opiliones. These arachnids are commonly spotted in moist, shaded environments, such as leaf litter, under logs, or among tall grasses, where they can stay hidden from predators. Unlike true spiders, harvestmen have a fused body without a distinct waist and only a single pair of eyes located at the centre of their head. While they occasionally enter sheds, outbuildings or garages, they are more often seen outdoors, especially during late summer and autumn. Their long, delicate legs allow them to move quickly, and they play an important role in controlling populations of small insects.

Giant House spiders can be found in the autumn months dashing across the floor of your home or business, usually in search of a mate. This increase in activity is most noticeable from late August through October, as mature males leave their web retreats in hope of finding females. Although their large size and rapid movements can be alarming, these spiders are not aggressive and don’t pose a threat to people or pets. Often, they seek out sheltered environments that homes provide, particularly basements, bathrooms, and quiet corners. Since Giant House spiders play a useful role by feeding on common household insects (flies, silverfish, gnats, mosquitoes etc..) their presence can be beneficial for pest control. While it is understandable to feel uneasy, it is worth remembering that these spiders tend to avoid human contact and will retreat if disturbed.

The cellar spider is sometimes known as the daddy longlegs spider. It gets its name due to primarily being found on the ceilings of rooms or cellars. These spiders have extremely long, slender legs, which make them look much larger than they actually are. Despite their delicate appearance, cellar spiders are skilled at catching and eating a variety of household insects, including flies and moths. Therefore, while they can be startling to spot, they play a helpful role in managing insect pests.

Garden spiders are found across the UK and Europe. The distinctive white marking on the abdomen have led to the nickname 'cross spider'. They are most commonly seen in late summer and early autumn, when adult females build large circular webs between plants, shrubs, and even outdoor furniture. Their colouring can vary from pale yellow to dark brown, but the pale cross-shaped pattern on the back is always present and makes them easy to identify. While their webs are often spotted in gardens, you'll also find them across paths or even by door frames, especially on dewy mornings when the silk glistens. Despite their impressive size and habit of sitting in the middle of their webs, garden spiders are not dangerous to people or pets.

Aptly named for their black and white marking, Zebra spiders are widespread across Britain and Europe. These small jumping spiders can often be seen on sunny days, hunting along garden walls, plant pots, and windowsills. While their appearance may seem striking, they are harmless to people and prefer to prey on small flying insects. Their exceptional eyesight helps them spot and carefully stalk their prey before delivering a quick leap to capture it. Since they do not build webs to catch food, their active hunting behaviour is quite different from that of many other British spiders.