They were hunted to near-extinction. Now a £3.5m project aims to let the Scottish molluscs flourish again
The sun shines on clear river water running through a valley in the Cairngorms, bringing the stones on the river bed into colourful focus. Here and there are dark shadows, half-buried clusters of dull black shells, lined and gouged by decades of shifting water and gravel: the pearl mussels of the river Dee.
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Source: Guardian Environment