Scientists are attaching tags to puffins in the Farne Islands, off the coast of North-East England, in an attempt to find out why this population is suffering from plummeting numbers.
But attaching the GPS devices is far from easy, as BBC science reporter Rebecca Morelle finds out.
Dr Richard Bevan from Newcastle University, who is leading the study, shows her that attacks from swooping Arctic terns and pecks from an angry puffin as it is plucked from its underground nest are all part of a day's work for puffin taggers.
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