Sustained, fast repetitive, high pitched, garden bird call

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John,

How about Eastern Spinebill.
Bruce

-----Original Message----- 
From: John Brown
Sent: Sunday, June 29, 2014 8:03 AM
To: COG_Mailing_List
Subject: Sustained, fast repetitive, high pitched, garden 
bird call

In my garden I often hear a sustained/continuous, fast repetitive, high 
pitched bird call, which stops the moment I open my door, never to restart 
when I am outside! And I've always failed to spot it through a window. What 
bird am I most likely looking for?
It is much higher pitched, faster and more sustained than a white-throated 
treecreeper  (which I wouldn't expect to see in my garden anyway)
All ideas welcome!

John


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