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Martin Hughes-Games visits the great ‘seabird cities’ of Orkney. Thousands of seabirds choose these vast cliff faces to lay their eggs and raise their young. It looks and sounds chaotic, but in fact each species has found its own niche.

And how on earth do these seabirds breed on such precarious rock faces without losing their precious eggs and chicks to the hungry sea many metres below?

Chris Packham has all the answers.