Recorded at dawn March 1st in mature forest/mature suburban edge.
Philadelphia (southeast Pennsylvania).
I've only heard this call Jan-March and it isn't on the Stokes' CD for this species.
Email answer to albrigh_1999@yahoo.com
Note for those not used to looking at sonagrams: 8-10 kHz is actually pretty high pitched.
http://www.birds.cornell.edu/AllAboutBirds/studying/birdsongs/son
"The first sonogram shows a 24-second recording of an American Goldfinch song. The song includes frequencies from about 2 kHz to 8 kHz."
Here is a the recording from which the sonagram came:
Click here for the answer:
