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All these birds of America are dull-coloured, but among the true Tits of the Old World are among the many brightest birds of the northern hemisphere. Different from these subspecifically allied kinds are the Northern Marsh Tits, often called P. borealis, and replaced by a very closely allied kind in the Alps. It is, however, as P. borealis just isn’t recognized to occur in Great Britain, extra vital for British ornithologists to tell apart it from the peculiar British Marsh Tit typically called P. palustris dresseri, and i could due to this fact repeat that it differs from the latter (...)