On 13th May 2021, I visited the beach at Thornwick Bay, Yorkshire, at low tide. On the high-water tideline at the top of a shingle ridge, a Wood Pigeon Columba palumbus was picking through the dried pieces of seaweed, selecting material for nest-building. Once a suitable piece was chosen, the bird would fly off and into a large cave-like tunnel through an outcrop at the back of


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