After 13 years of birding, one hates to appear ignorant - but on last evening's Aitkin trip we heard a song we could not ID.
The two birds were singing at 8:30 PM along Aitkin CR 5, about three layers back in rather open mixed woods, upper canopy. The song was long, ~25 notes on average, with repetitions up to six notes. One set of notes was goldfinch-like, similar to the flight call, but without the Doppler effect a goldfinch often has. The other notes were more flute-like, slightly ascending & rather sharp at the end, a bit jumbled. Those notes would be first, followed by the finch-like notes, followed by a second set. Neither bird responded to pishing (or wishing). I know that written song descriptions are difficult to work from, but any ideas? Thanks! Al Schirmacher Princeton, MN Mille Lacs & Sherburne Counties

