ML468792271
Beitragende/r
Datum
Ort
- Alter
- nicht spezifiziert
- Geschlecht
- nicht spezifiziert
- Klangattrappe
- nicht spezifiziert
Beobachtungsdetails
I initially thought these were the typical Type 5s (of lodgepole pine). However, Merlin immediately called them Cassias. I was skeptical of that at first, but I knew that I didn't even know what Cassia ("type 9") even sounded like at the time, so I wondered. I was very busy though overall, having to finish my own field season work, and only now have had time to process the recordings and inquire about their ID. I was reminded to do so when a couple young birder friends sent out a note on the state listserv last night saying they had possible Cassias in an area very close to where I encountered these birds. The area I was in is some of the finest lodgepole pine forest I've ever been in, in the sense of bird diversity and number, as lodgepole tends to be pretty uniform and monoculture in Colorado. But this area mixes lodgepole with a fair amount of aspen, doug-fir, and I think some subalpine fir, as well as some willow carrs nearby in the wetter drainages. The birds I recorded were a number of juveniles (that I saw) mixed in with a couple adults. (39.705, -106.170) addendum: I've added a second audio file, same content as the first but I increased the gain and kept it as a .WAV so no compression errors. addendum 2: I've now added a third audio file, different from the previous. This was from a few minutes prior to the flyaway, when the birds were foraging, mostly quietly, but occasionally bursting out in communications. I have no other substantial audio samples than these. addendum 3: I heard back from Matthew Young at Cornell, who confirmed that all the calls in these recordings are Cassia. I recommend comparing these spectrograms to those of all crossbill types described at https://ebird.org/news/crossbills-of-north-america-species-and-red-crossbill-call-types/ .
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