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Featherweight songbird is a long-distance champ

A tiny songbird weighing just two tablespoons of sugar migrates from the Arctic to Africa and back, a distance of up to 29,000 kilometres (18,000 miles), scientists reported on Wednesday. The size of an undernourished sparrow, the northern wheatear (Oenanthe oenanthe) tips the scales at just 25 grammes (0.9 of an ounces).…

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