By species

For each of the featured categories, the first four butterfly species are shown. Click on the image to access the species’ datasheet or browse the full list of species by using the ‘All’ tab (you can use the filter to shorten the list).

• Highlights
• All

Increasing populations The species with the highest annual population growth rate	Declining populations The species with the most negative annual population growth rate
Greatest increase The species with the highest population increase in 2022-2023	Greatest decrease The species with the greatest population decline in 2022-2023
The commonest The species occurring in the fewest stations	The rarest The species occurring in the fewest stations
The most abundant The species with the highest counts in the past season	The least abundant The species with the lowest counts in the past season

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Illustrations by Richard Lewington from Tolman & Lewington (1997) Butterflies of Britain and Europe, translated and published in Spanish by Lynx Edicions.