Changes in UK butterfly populations, All UK resident species

Changes in butterfly populations are measured as an index relative to populations in their start year (1976 or 1990depending on the species group).

19762021198019902000201050Smoothed

Data source: UK Office for National Statistics; Department for Environment, Food & Rural AffairsLearn more about this data

Note: Year-to-year fluctuations in butterfly numbers are often linked to natural environmental variation, especially weather (unsmoothedindex). We therefore used a smoothed index to understand underlying patterns of change.

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Changes in UK butterfly populations

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