This is an interesting call, but I think not from Northern Parula. That species typically does not have this much broad waviness along the main trunk of the call, and there is no sign of the ~4 ms finer modulations - though playing around with spectrogram parameters would be necessary to rule that out. My best guess is this could be a flat variant of the descending “zeep” Yellow Warbler regularly gives in fall migration (at least in eastern NA). There is no example of the descending YEWA nfc in the original flight call guide - the 2nd ed. will have it.
Bill Evans From: Wim van Dam Sent: Saturday, October 26, 2019 2:38 AM To: Night Flight Call Discussions Subject: [nfc-l] good/good enough for Northern Parula? On October 19, in Solvang, California, I recorded the following night call, which I consider a possible Northern Parula. The 7 second WAV recording, spectrogram, and written description are all in this eBird report: https://ebird.org/checklist/S60930344 I'm curious to hear if people agree with this ID, or if I should consider another (more common) species. Thanks Wim van Dam Solvang, CA, USA -- NFC-L List Info: Welcome and Basics Rules and Information Subscribe, Configuration and Leave Archives: The Mail Archive Surfbirds Birding.ABA.Org Please submit your observations to eBird! -- -- NFC-L List Info: Welcome and Basics � http://www.northeastbirding.com/NFC_WELCOME Rules and Information � http://www.northeastbirding.com/NFC_RULES Subscribe, Configuration and Leave � http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm Archives: The Mail Archive � http://firstname.lastname@example.org/maillist.html Surfbirds � http://www.surfbirds.com/birdingmail/Group/NFC-L Birding.ABA.Org � http://birding.aba.org/maillist/NFC Please submit your observations to eBird! ��http://ebird.org/content/ebird/ --