Seen a cluster of ladybirds on a sunny window frame? It can look alarming, especially when dozens appear at once, but in most cases it is harmless.
Here are five quick things to know.
1. Why ladybirds swarm indoors in autumn
Ladybirds look for sheltered places to spend the colder months. Warm, sunny walls and window frames can guide them towards gaps around windows, loft spaces, vents and rooflines.
They are not moving in to feed or breed. They are simply looking for somewhere safe to overwinter.
2. It is usually the harlequin ladybird
In UK homes, large autumn gatherings are often caused by harlequin ladybirds. They can be red, orange, black or yellow, with different spot patterns, which is why they are sometimes confused with native ladybirds.
Native ladybirds can also shelter in buildings, but harlequins are more likely to gather in noticeable numbers.
3. Are they harmful?
No, not in the way many people fear.
Ladybirds do not damage the house, chew timber, infest food or breed indoors like some household pests. The main issue is that they can be startling in large numbers.
Try not to squash them, as they can leave a yellowish stain and a slight smell.
4. Why the same spot every year?
Ladybirds are drawn to warmth, light and shelter. If one window or wall gets autumn sun and has tiny entry points nearby, it can become a repeat gathering spot.
That is why the same bedroom window, bay window or upstairs frame may attract them year after year.
5. How to get them out and keep them out
The best approach is gentle removal and prevention.
Use a glass and card, a soft brush, or a vacuum on a low setting if there are lots of them. Release them outside near shelter if the weather is mild.
To reduce repeat visits, seal gaps around window frames, repair damaged seals, fit insect mesh over vents where suitable, and check loft or roofline entry points before autumn.
If you are dealing with repeated clusters and want local help, see our guide to how to get rid of ladybirds.