
Between 2000 and 2020, 33% of species (114 of 342) showed significantly declining trends in abundance, according to the research led by Collin B Edwards of Washington State University and published this week in Science.
The results mirror the picture in the UK, where 80% of butterfly species have decreased in abundance, distribution or both since the 1970s.
It comes after Butterfly Conservation recorded the worst-ever results of its annual Big Butterfly Count in 2024 and declared a Butterfly Emergency in the UK, calling on the Government to take tougher action to save wildlife, starting with a total ban on butterfly-killing neonicotinoid pesticides.
Comment: Related: Lowest number of UK butterflies ever recorded during summer of 2024 due to wet weather