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Blue
Tit Cyanistes caeruleus

Brent
Reservoir, London, England 51°
34' 36.0'' N 00° 14' 44.9'' W 9
May 2009
Territorial song at a rate of 16 phrases/min (note:
hourly chime from my wrist watch at 9.7 sec, 8.2
kHz).

Brent
Reservoir, London, England 51°
34' 36.0'' N 00° 14' 44.9'' W 9
May 2009
Territorial song (detail from above sonogram).

Sunny
Hill Park, London 23
March, 0545h, 0șC, hard frost
Territorial song from garden, ~1.5 metre
from ground.

Kindrogan
Field Centre, Perthshire, Scotland 56°
44' 54.3'' N 03° 32' 55.1'' W
13 June
2009
Calls
from a brood in a nest box, alternating with calls from
an adult with food outside; an alarm call at 6 sec,
silenced the brood.
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