Christian,
Thanks for the link to the crossbill update on eBird; I hadn’tseen this article
yet and it is a topic that is of keen interest for me, and you are right, it is
a good one. Like you, I have been into and recording crossbills for years now
asthey represent the most fascinating “evolution in progress” stories that we
aregetting to witness at this point in time.
Given the projections in the article of an invasion year in theEast and South
of North America, I wanted to throw in a brief status reportfrom up here in the
Panhandle of North Idaho. Red Crossbills aregenerally abundant up here, but
have been largely absent for the past eighteen(18) months or so, and I have yet
to hear even one since returning from Denverabout three weeks ago. Our cone
crops seem to be in decent shape, withornamental spruces in town at least
fairly heavily laden – hoping theWhite-wingeds make a good showing at some
point – so not entirely sure what’sgoing on. Anyway where this may come into
play for Colorado birders thisyear is that our regular Red Crossbill types up
here, Ponderosa (type 2),Hemlock (type 3), and Douglas-fir (type 4), have gone
somewhere, so keep yourears (and recorders) open when encountering a flock.
Nick’s post about amix of Red Crossbills earlier this week is a good case in
point.
Good Birding,
Doug
Denver…but Coeur d’Alene, ID at the moment.
From: Christian Nunes <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Tuesday, November 7, 2017 10:02 PM
Subject: [cobirds] More Red Crossbill Info
#yiv8644267770 #yiv8644267770 -- P
{margin-top:0;margin-bottom:0;}#yiv8644267770 As others have noted on the
forum, there's a perceptible Red Crossbill incursion occurring across the
region this fall. I'd like to stress the importance of recording crossbill
calls. A simple voice memo from a smart phone can be uploaded and analyzed with
free software (e.g. Ravenlite) or simply uploaded to eBird where a spectrogram
will be produced automatically. If the recording is of high enough quality, the
shape of the crossbill's call notes can be seen without any extra manipulation.
The recent eBird article on crossbill types is by far the most succinct and
useful resource yet published on the web. By comparing the shape of the call
notes on a spectrogram, the identification of precise types becomes almost
easy.
eBird resource:
http://ebird.org/content/ebird/news/crossbills-of-north-america-species-and-red-crossbill-call-types/
| | Crossbills of North America: Species and Red Crossbill ...ebird.orgAs one
of the most striking differences in bird occurrence from year-to-year in many
northern regions of the world, finch irruptions are often exciting events. |
Type 2 (Ponderosa Pine) and Type 5 (Lodgepole Pine) are the common breeding
types in CO, and Type 4 (Douglas-fir) are irruptive. Other types wander into
the state less frequently, most notably Type 3 (Western Hemlock). Several
others are possibilities (maybe Types 7 & 10?), but we'll never document them
without good recordings.
Some recent observations and recordings of Type 4 (Douglas-fir) crossbills from
CO:
http://ebird.org/ebird/view/checklist/S40332272 (Nick Komar and Walter Wehtje,
Lake Loveland)http://ebird.org/ebird/view/checklist/S40329801 (my yard, Lyons)
http://ebird.org/ebird/view/checklist/S40016606 (Nick Moore, Greeley)
Documentation of Type 3 (Western Hemlock) by Steve Mlodinow at the Eaton
Cemetery:
http://ebird.org/ebird/view/checklist/S25815587
Happy listening,
Christian NunesLyons, CO
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