Large heath butterfly unfurls its wings
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Large heath butterfly unfurls its wings

After three years of careful captive breeding, scientists from Chester Zoo say they have established a wild colony of a rare butterfly at Heysham Moss in Lancashire.

The insects have been absent from the area for a century.

This time-lapse video shows one of the butterflies unfurling its wings after emerging from a cocoon in one of the zoo's custom-built pods.

Footage courtesy of Chester Zoo.