American Goldfinch (Carduelis tristis), June 27, 2009, Jackson Marsh, Washington County, WI.
I’ve searched the archives at Xeno-Canto and Macaulay Library but I haven’t been able to find another recording of this particular vocalization. Superficially it is similar to the well-know “potato-chip” flight call, but the speed of delivery is faster, the notes are ascending, and there are more than 4 notes per series. Unfortunately I do not know the sex of the bird vocalizing. I observed a pair of goldfinches fly into an area of dense shrubbery and this is the sound that came forth. I didn’t have a visual of the bird while I was recording. Given that, I cannot be 100% certain that this is actually an American Goldfinch, but considering the overall quality of the vocalization, the location, season, and circumstance, I believe it is a fair call.