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Puffins living in one of the most remote places in the UK are to be fitted with "sat nav" devices in a bid to help scientists discover why their numbers are falling.

This summer researchers will use GPS technology to track the movements of a colony of puffins living on the Farne Islands, off the Northumberland coast, in a bid to explain a "dramatic" decline in the bird's population in the past five years.

puffin population decline greenmonktv gps