UK conservationists are celebrating a successful summer for a rare butterfly, which went locally extinct in 1979.
An estimated 10,000 large blue butterflies have been recorded at sites across southern England - the largest number for at least 60 years.
Efforts to rebuild the population have been underway since 1983, when Swedish caterpillars were introduced to the UK.
Experts hope the project will show that such programmes can help other species threatened with extinction.
More than 150 scientists, conservationists and volunteers have been involved in the Large Blue Project, a partnership of 11 organisations, co-ordinated by the Centre for Ecology and Hydrology.
Dave Simcox, manager of the project, said there was still more work to be done.
“Whilst one landscape in Somerset is reasonable secure, the real challenge is to replicate this success throughout the Cotswolds, South Devon, and the Atlantic coasts of Devon and Cornwall,” he explained.
Dr Nigel Bourn, director of species conservation at Butterfly Conservation, said it offered hope for other threatened species.
“Given the proper resources, we can restore a countryside full of butterflies and other wildlife,” he said.
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