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Garden
Warbler Sylvia
borin

Brent
Reservoir, London, England 51°
34' 36.0'' N 00° 14' 44.9'' W 9
May 2009
Territorial song from dense scrub. Two different verses
in this sonogram (with pause around 5 sec); first
one represents the typical bubbling warble including
low frequency notes down to 1.3 kHz, the second starting
with high-pitched wheeze-like notes.

Grzedy,
Biebrza Marshes, Poland 53º
37' 44.4'' N 22º 46' 25.5'' E
2
July 2009, 1905h
Territorial song from mature woodland.
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