In recent years, I have found it increasingly difficult to separate Marsh Tits Parus palustris from Willow Tits P. montanus. I do not believe, as some might suggest, that this is related to advancing years or increasing deafness! Nor do I think that it is solely due to diminishing familiarity as a result of the declining population of Willow Tits in East Anglia. On visiting Norway in July 2002, I

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