The Shetland Wren, ssp 'zetlandicus', is the local variety of the Winter Wren found all over Britain, and a probable incipient species. It's a common resident over most of Shetland, and it's sedentary behaviour makes it unlikely to be found outside these islands.
Below are photographs of adult birds;
And Juvenile birds;
Adult at the nest;
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Typical nest location, under an overhanging edge;
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Below are some sound recordings of 'zetlandicus'...
Adult in full song; http://www.xeno-canto.org/europe/recording.php?XC=48202#
Adult in full song; http://www.xeno-canto.org/europe/recording.php?XC=48209
Alarming adult; http://www.xeno-canto.org/europe/recording.php?XC=48210
Juv. begging calls; http://www.xeno-canto.org/europe/recording.php?XC=48211
and a photo of the Fair Isle ssp;
and a 'British' Wren (complete with a tick behind it's eye!), photographed in Central Scotland. Hope you can see the difference (I'm stuffed if I can !)
