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Black-Veined White Butterfly Reintroduced to UK After Century-Long Absence

Environment5/13/2026
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The black-veined white butterfly, extinct in the UK since the early 20th century, has been reintroduced to the Knepp Estate in West Sussex. Larvae were imported from continental Europe and released into a rewilded landscape. The project aims to establish a new population and potentially reconnect it to ancestral habitats.

Facts First

  • Extinct in the UK for over a century due to land-use changes and habitat loss.
  • Reintroduction project organized by the Knepp Wildland Foundation, the nonprofit arm of a rewilding estate.
  • Larvae imported from continental Europe in special containers to overwinter and acclimatize.
  • Supported by multiple conservation organizations including Butterfly Conservation and Natural England.
  • Future operations may aim to connect populations to ancestral hotspots like Devon and the south coast.

What Happened

The black-veined white butterfly has been extinct in the United Kingdom since the early 20th century. A reintroduction project, organized by the Knepp Wildland Foundation, imported larvae from continental Europe to the Knepp Estate in West Sussex. The larvae were transported in special containers designed to allow them to overwinter on the estate and acclimatize to British conditions. Prior to the importation, the Knepp Wildland Trust conducted climate and environment studies to determine if conditions would be appropriate. The Knepp Estate is a biodiverse, rewilded area of newly-naturalized wooded grasslands.

Why this Matters to You

This reintroduction represents a tangible step in restoring a piece of the UK's natural heritage that was lost. If successful, it could enhance the biodiversity of local ecosystems, which may support other species like nightingales and the purple emperor butterfly already present at Knepp. You might eventually see this butterfly in more parts of the country if future plans to connect populations to ancestral hotspots succeed.

What's Next

The project's future operations aim to connect the butterfly population to ancestral hotspots such as Devon and the south coast, if current plans succeed. The reintroduced butterflies will need to establish themselves in their new habitat, which consists of hawthorn and blackthorn shrubs.

Perspectives

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Nature Enthusiasts celebrate the successful growth of the black-veined white butterfly on local shrubs and note the general affection the British public holds for butterflies.
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Conservation Observers highlight that the current progress is 'especially encouraging' given that previous reintroduction attempts for this species have failed.
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Environmental Journalists characterize the Knepp Estate as Britain's 'most famous' rewilding project and refer to the butterfly as a 'black-veined beauty'.