All- I could use some help on this recording from my house in Sand Lake, MI at 2346 hrs on September 25, 2012. It was made with Bill Evans's 21c microphone.
Audio: http://soundcloud.com/user9140545/sparrow-sp-sep-25-2012-2346 Sonogram: http://www.flickr.com/photos/27846187@N07/8054073788/ The bird was lateral to the microphone a fair ways, perhaps 100m, and so the signal was not picked up as strongly as I had hoped. I was listening on my roof at the time and immediately recognized this as different from the numerous Savannah Sparrows which were flying that night, mainly because of the longer duration note. Depending on how you measure it, it appears to be about 0.15-0.18 seconds long, but I am not clear that the end of the note wasn't cut off due to the poor recording (?) since the bottom band gets 'fuzzy'. I immediately suspected Nelson's (NESP) or Le Conte's Sparrow (LCSP), but the bands don't appear as parallel as the ones for LCSP in Evans and O'Brien (Flight Calls of Migratory Birds) and are not a perfect match for any of the NESP/LCSP recordings I see there. They do seem close to the Fig. 6 recording for NESP from April 26, 1989 in Florida (listed as hypothetical). Can any progress be made on this one, or shall I best leave it as sparrow sp.? Or can I confidently call it an Ammodramus sp., or even Le Conte's/Nelson's? Thanks, Caleb -- Caleb G. Putnam Sand Lake, MI caleb.put...@gmail.com -- NFC-L List Info: http://www.NortheastBirding.com/NFC_WELCOME http://www.NortheastBirding.com/NFC_RULES http://www.NortheastBirding.com/NFC-L_SubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NFC-L 3) http://birdingonthe.net/mailinglists/NFCL.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
