The seven nights of nocturnal migration ending Sunday tell a tale as much about weather as birds. I suspect this bird is a Hooded Merganser.
For guidance, I went to the scientific literature: Previous workers have suggested the birds give flight calls in response to fear, loneliness, hunger, or the approaching light of dawn. Meade Cadot also reported his first of the season on the same day, as did several other birders throughout the region. document.write(today.getFullYear()); Migrating at night makes a lot of sense for birds. The first audio recordings of nocturnal bird migration came about in the 1950s; in those days some researchers captured the calls on reel-to-reel tape recorders hooked up to large microphones set inside rings of sound-insulating hay bales. You reference the live spectrogram in Raven and can see the sound—a burst of sonic energy of relatively high frequency that lasts for only milliseconds. Green Heron, Killdeer, Long-tailed Duck, etc. Automated Extraction on a PC with Tseep/Thrush/Dick: As for Mac users, you can try using Audacity (a free program) or Raven (a program designed by the Cornell Lab or Ornithology specifically for working with bird calls) to extract NFCs by hand. Researchers from MPG Ranch and the University of Montana placed an ARU at the Line Ranch in Missoula, on a Conservation Easement secured in collaboration with Five Valley’s Land Trust. 0000001254 00000 n Not even a Barred Owl to mark the night. Identification of nocturnal migrants by call note comes with a degree less conviction than does identification of birds by sight during the day. frogs, wind, road noise) so be prepared for the recording to be a bit loud. April 14: 2 migrants It didn’t last long though, with migration shut down again by Tuesday. Otherwise, you may require an Audio In to USB adapter. Given that the last week in October tends to be the final push of migrant warbler species in Southeastern PA, you can narrow your search down to warblers you’d expect to see on that day: Blackpoll, Pine, Yellow-rumped, Palm, Common Yellowthroat, Nashville, and maybe a few others. Farnsworth, A., The Auk, Vol. Flying under the cover of darkness makes identifying species and counting numbers challenging for ornithologists. I haven’t checked the audio files yet, but I already know that I won’t find a single recording of a Blue-headed Vireo. Their call notes are fairly loud compared to warblers and sparrows, and they call in the lower frequency bands, meaning that the sound carries farther. The first phase will be to cover the 50 nocturnal migrants we judge most likely to be recorded giving flight calls during nocmig sessions in western and central Europe. Waterfowl start moving north early in the season, and by the end of March, their migration is largely over. There are a number of fantastic resources for NFC recording out there, all of which have been created by wildly passionate birders.
fax: (603) 525-3395, © 2020 Harris Center for Conservation Education, Photos © Colin Durfee, Doug Greenberg, Stan Lupo, Becky Matsubara, Bill Majoros, Jacob McGinnis, Tom Murray, Putneypics, John Sutton, Aaron Maizlish, Dave Inman, Jen Goellnitz, Monadnock Region Natural History Conference, The Harris Center for Conservation Education. x�b```b``�b`e`�Mda@ �+ǂF�� ����?�� If you’re using a machine that’s older than 1-2 years, then you likely have audio input capability built-in (a feature that was removed on newer models). Of course, you can always sit outside and listen with your ears, but there are some definite benefits to recording through your computer: How to Collect Sound: The “Flowerpot” Microphone. You can read more from Kelley on her website – MyMigraineBrain.com. April 19: 56 migrants, including Virginia Rail, American Bittern, Chipping Sparrow, White-throated Sparrow, and first-of-season Palm Warbler. Knowing who is using stopover sites and how they use them is important for conservation. Blue-headed Vireo. For more about the Old Bird analysis software available and how to use these programs, see: http://oldbird.org/analysis.htm. This way, you can review what species flew over your home in the night (if you’re interested.) Migrating thrushes also have distinctive NFCs. As a Mac user, I have never tried any of said software, but everything you need to know about Glassofire is listed at the Old Bird website: http://oldbird.org/glassofire.htm. NFC.
I didn’t record any on my microphone because swallows are diurnal migrants.