Living Planet: Why we should celebrate World Migratory Bird Day

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It's spring in the northern hemisphere - and one sure sign of that is the flocks of geese, cranes and other migratory birds flying overhead, coming back in for the summer. On May 10, we celebrate World Migratory Bird Day. In an interview, Borja Heredia, head of the avian unit at the United Nation’s Convention of Migratory Species, explains why migratory birds are so important.

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