The Large Tortoiseshell Butterfly Returns to England

 


The Large Tortoiseshell Butterfly Returns to England 

For the first time in more than 60 years, the Large Tortoiseshell butterfly (Nymphalis polychloros) has begun returning to southern England after disappearing from the UK in the mid-20th century.

The reason? Warmer temperatures across Europe.

Scientists and butterfly recorders have recently reported sightings in Dorset, Hampshire and Sussex, suggesting the species is recolonising Britain from populations in France and mainland Europe.

A Butterfly Lost… and Now Returning

The Large Tortoiseshell was once a familiar sight in parts of southern England during the 1800s and early 1900s. But by the 1950s it had vanished from the UK.

The exact cause of its disappearance is still debated, but several factors likely played a role:

  • Loss of elm and other host trees

  • Colder and wetter summers

  • Changes in land use and farming practices

Unlike some resident butterflies, this species is also partly migratory, meaning populations can fluctuate depending on conditions across Europe.

Why Climate Change Matters

Recent warmer springs and summers have made southern England more suitable for the species again.

Warmer conditions allow the butterfly to:

  • Expand its range northwards

  • Successfully breed in Britain

  • Survive winters that would previously have been too cold

In short, the UK is once again becoming part of its natural range.

A Sign of Change in Nature

The return of the Large Tortoiseshell is a fascinating reminder that wildlife responds quickly to climate shifts.

Some species struggle as the climate changes, while others expand into new areas. In Britain we are already seeing:

  • Southern butterflies moving north

  • Earlier flowering seasons

  • Changes in bird migration patterns

For nature lovers and photographers, this means new species may appear in places where they haven't been seen for generations.

What Gardeners Can Do

If the Large Tortoiseshell is returning, gardens and green spaces can help support it.

Simple actions include:

🌿 Planting nectar-rich flowers
🌳 Protecting native trees such as elm and willow
🍎 Allowing fallen fruit in autumn (a favourite food source)
🌼 Avoiding pesticides where possible

Small changes can make gardens into valuable butterfly habitats.

A Small but Hopeful Story

Climate change often brings worrying news, but occasionally nature gives us a surprising story like this one.

After more than half a century away, the Large Tortoiseshell may once again become part of England’s butterfly population.

For anyone out walking in southern England this summer, keep your eyes open — you might just spot one.

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