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Swallows,martins,cuckoos and many other summer visitors have yet to arrive this year and on this edition of Nature\'s Voice we hear from Bird\'s Magazine editor Mark Ward about why this might be. Plus Danae Sheehan - the RSPB\'s migrant\'s programme manager - talks about her work in West Africa, where many of these birds overwinter, why their numbers are declining and conservation projects involving local villagers which benefit both birds and people