More than three-quarters of the UK's butterflies have declined in the past 40 years, according to a report by the charity Butterfly Conservation.
The study, State of the UK's Butterflies 2015, suggests 76% of resident and regular migrant butterflies have declined.
Some common species have suffered what the charity calls "major slumps".
Thousands of data-gathering volunteers enabled scientists to build up this long-term national picture.
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