Curious sound

["el_supremo01" <>]

I've occasionally been setting up my minidisk recorder with the
microphone sticking out the dining window and leaving it recording for
a few hours.

I've recorded visits by several flocks of waxwings plus flocks of
geese flying by and a Merlin screeching as it flew over. And of course
there's House Finches, Dark-eyed Juncos and American Robins singing.

Here's a sound that I wouldn't have been able to identify if I hadn't
happened to go upstairs to make a cup of tea at just the time when
this was being recorded:
http://members.shaw.ca/digipete/015_0330.mp3
Do you know what it is?

Best Wishes
Pete
Saskatoon, SK, Canada






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