Britain's striped grassland hunter

Discover the astonishing wasp spider, where it lives, how it hunts and why mating is a dangerous game for the males.

The wasp spider (Argiope bruennichi) is one of Britain’s most eye-catching arachnids. With bold stripes and a beautifully engineered web, this orb-weaving spider is hard to miss where it occurs. Once largely associated with southern England, it is now spreading further north as suitable habitat becomes available.

The female is the star of the show. Much larger than the male, she wears vivid yellow, black and white markings that give the species its wasp-like appearance. This striking mimicry may help deter predators by suggesting danger, even though the spider itself poses no threat to people. Males are smaller, duller and far less conspicuous, often staying hidden in vegetation close to the female’s web.

Late summer is a good time to look for wasp spiders as females are busy feeding on insects and producing egg sacs that will see the next generation through winter. After mating, the female creates a large, brown, papery egg sac and attaches it to nearby vegetation. The spiderlings hatch the following spring and disperse by ballooning, releasing fine silk threads that catch the wind and carry them to new places. Look for their webs in grasslands, meadows and other open, sunny places, including heathlands of Hampshire & Isle of Wight Wildlife Trust nature reserves.

A female wasp spider hanging upside down on a web

Wasp spider © Chris Fairhead

Their large, circular webs are usually built low among grasses and often include a bold zigzag of silk known as a stabilimentum. Its exact purpose is still debated, but it makes the web as distinctive as the spider that made it. These webs trap grasshoppers, crickets and other small insects, the spider then quickly wraps them before delivering a venomous bite. The venom is effective on small prey but harmless to humans.

For males, mating is risky. They wait near the edge of the female’s web until she has moulted into her mature form, then move in while her jaws are still soft. Even then, many do not escape being eaten.

Around 660 species of spider have been recorded in the UK, and none are deadly to humans. The wasp spider may look dramatic, but it is simply another fascinating predator playing its part in grassland ecosystems.