Britons are puzzled by the sight of numerous ladybirds congregating near windows and infiltrating residences. The presence of harlequin ladybirds, a non-native species, has sparked discussions on social media, with many individuals questioning the sudden influx and widespread distribution of the insects. Observers have reported seeing a significant number of ladybirds around their homes, prompting comparisons to the phenomenon of flying ant day.
Experts are advising the public not to panic, attributing the surge in ladybird sightings to the insects’ annual autumn migration as they seek refuge in preparation for the colder weather. According to Prof Helen Roy of the UK Centre for Ecology and Hydrology, ladybirds face challenges during the winter months and adapt by becoming dormant. Different species of ladybirds have specific wintering sites, with some, like harlequin ladybirds, seeking shelter in buildings, while others, such as 7-spot ladybirds, opt for leaf litter. As temperatures rise in early October, ladybirds actively search for suitable locations to hibernate.
The warm and sunny weather in early October triggers ladybirds to take flight in search of cozy spots to spend the winter, resulting in numerous sightings across the UK. The instinct of ladybirds to seek warm and sheltered environments often leads them indoors. Max Barclay, Senior Curator of Beetles at the Natural History Museum, highlights that certain ladybird species traditionally hibernate in large clusters in caves or hollow trees.
Due to the lack of natural habitats, ladybirds may attempt to enter buildings through small openings around inadequately sealed windows. It is recommended that individuals refrain from harming the ladybirds and instead gently relocate them if necessary. Harlequin ladybirds, introduced to the UK in 2004 from Eastern Russia, China, and Japan, exhibit a wide range of color variations, from orange with black spots to nearly black with red spots.
Although ladybirds can carry parasites and diseases, including a sexually transmitted fungus, experts assure the public that these insects do not pose a threat to humans. Mr. Barclay explains that the fungus manifests as yellow crust-like scales on the ladybirds’ exoskeleton, making it visible to the naked eye. The presence of this fungus does not endanger individuals interacting with ladybirds.