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The coco de mer, or double coconut, can weigh up to 18kg. How did it become the giant of the seed world? The coco de mer palm is native only to two remote islands of the Seychelles in the Indian Ocean; its closest relative is the borassus palm, found today in Sub-Saharan Africa. Dr Frauke Fleischer-Dogley goes back millions of years to when Africa and the Seychelles were part of the same supercontinent, and explains how the evolution of the coco de mer is bound up with the evolution of the Earth.