Britain is currently experiencing what experts describe as a “painted lady summer,” with an influx of the migratory butterflies reaching levels not seen in 17 years. Driven by heatwaves and favorable winds, thousands or potentially millions of these insects have moved north from their origins in sub-Saharan Africa.
The migration is the result of successive breeding generations in North Africa and the southern Mediterranean. According to Dan Hoare, director of nature recovery for Butterfly Conservation, the recent immigration follows successful breeding in France and Spain during a period of intense heat. Upon the collapse of that hot spell, favorable winds assisted the butterflies in crossing the Channel.
The arrival is marked by a mix of generations, including faded grey “grandparent” butterflies that may have traveled from North Africa or southern Spain, alongside brighter orange short-haul travelers born in France. Large numbers have been reported along the east coast and into northern England, with 253 individuals spotted on a single patch of bramble flowers at the Hickling national nature reserve.
The movement has also brought rare visitors to British shores, including the eastern bordered straw moth and striped hawkmoths. While the presence of these insects is a notable ecological event, it also offers benefits to local environments; gardeners and farmers often welcome the butterflies because their caterpillars feed on a wide range of thistles.
What Happens Next
In the coming weeks, a large British-born generation of painted ladies is likely to emerge. This timing coincides with the annual Big Butterfly Count, a citizen science initiative involving 100,000 volunteers each July. The influx could result in a significantly larger brood for participants to observe during the count.
the mass arrival may trigger a late surge in voting for Butterfly Conservation’s poll to determine Britain’s favorite butterfly. As the painted lady gains visibility, it could potentially challenge the peacock butterfly for the top spot in the rankings.
Frequently Asked Questions
Where do the painted lady butterflies originate?
They begin their journey in sub-Saharan Africa at the start of each year, breeding through successive generations in North Africa and the southern Mediterranean before reaching northern Europe.
Why is this year’s migration considered significant?
It’s expected to be the largest arrival in Britain in 17 years, fueled by a combination of favorable early spring conditions in southern Europe, recent heatwaves, and benign southerly winds.
How can the public get involved in tracking these butterflies?
The public can participate in the Big Butterfly Count, a citizen science insect count held every July, or cast a vote in the Butterfly Conservation poll to name Britain’s favorite butterfly.
Have you noticed an increase in butterfly activity in your local garden or park this summer?
