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Type 1 flight calls recorded in an area with relatively loud background machinery. Edits: trimmed and normalized to -3 dB. Uploaded 2017 Oct. 18.
Деталі спостереження
I saw three in flight while simultaneously hearing their calls. At least two others also called nearby from atop other trees but I wasn't able to see them. Identified by their flight calls and trills; not identified visually. I'm very familiar with evening grosbeak calls because I heard them many times while growing up in northern New England in the 1970s and 1980s, when they were relatively common. Recorded with an Olympus LS-10 recorder equipped with a 22 inch parabolic dish and a Sennheiser ME62 microphone. Audio spectrograms indicate that most of the birds were type 1 evening grosbeaks but also reveal at least one type 2. The type 1 flight calls rise rapidly in frequency and then have a downward-slurring trend with an inflection in the middle at a frequency of about 3900 Hz. The type 2 calls rise and then fall more gradually in frequency. Both look indistinguishable from the figure showing flight call variants in Sewall et al. 2004. Recordings are available on Xeno-Canto at: http://www.xeno-canto.org/205681 http://www.xeno-canto.org/205682 The first recording documents both types 1 and 2. The second recording shows only type 1. I got several other recordings but these are the ones with the highest signal-to-noise ratios.
Технічна інформація
- Записуючий пристрій
- Olympus LS-10
- Мікрофон
- Sennheiser ME62
- Допоміжні пристрої
- Telinga 22 inch parabola
- Розмір вихідного файлу
- 2.36 MB