Norwick: 7 Knot, 5 Swallows & Willow Warbler.
Marsh Warbler at Skaw
Calling frequently, it enabled me to obtain a recording of what's oft-described as the species 'alarm call'. To my mind, it's very similar to that of a Blyth's Reed Warbler. Here's a sonogram of the above recording with some comparison sonograms from xeno-canto:
Sonogram of calls of Marsh Warbler at Skaw
Sonogram of calls of a Marsh Warbler recorded in Ukraine
Sonogram of a call of a Blyth's Reed Warbler recorded in Finland
The very different, so-called 'tscheck' alarm call of a Reed Warbler recorded in Sweden.
