On 23rd June 2018 at Moor Green Lakes nature reserve in Finchampstead, Berkshire, I noticed a Carrion Crow Corvus corone flying towards me along the wide riverside path. The bird dropped a hard, dark object from its bill, and when I reached the area I found a hard, stony patch of the path with a large number of mussel shell fragments scattered around. It became clear that the Carrion Crow was deli
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