While visiting the National Zoo for a friend's work event on Saturday, I
was surprised to hear a Common Raven croaking from atop an oak tree near
the seal tanks.I made a (bad) recording, using my cell phone and uploaded
it here: http://soundcloud.com/pgbird85/common-raven-national
I marked the spots on the spectrogram when you can hear the Raven. The rest
of the recording are the sounds of people enjoying the zoo.
Rob Ostrowski
Bowie, MD
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