Emerging stonefly, Perla bipunctata, as it leaves the final instar to become an adult. Taken on the River Wear at Stanhope stepping stones.

- Image ID: 2AGR2E7
Emerging stonefly, Perla bipunctata, as it leaves the final instar to become an adult. Taken on the River Wear at Stanhope stepping stones.
DAVID HIGGINS / Alamy Stock Photo
Image ID: 2AGR2E7
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