Re: [cobirds] Getting ready for hummingbird field trips

[Peter Burke]

Just to add to Chuck’s post, another good hummingbird reference is an
excellent article by David Tønnessen in the Summer issue of Colorado Birds
on female-type hummingbird identification, available to all CFO members on
the CFO website.

Good birding,
Peter Burke, Boulder CO

On Thu, Jul 14, 2022 at 7:51 PM Charles Hundertmark 
wrote:

> Just finished watching David Suddjian’s “Bird Bomb” DFO webinar covering
> Summer’s Hummers. This short webinar is a great preparation for our
> July-August surge of hummers. Whether you are preparing for CFO’s
> Hummingbird field trip series (see cobirds.org) this month and next or
> just watching feeders in your own yard, David has do a great job of
> providing insight on key identification features of our four most likely
> Colorado hummers. The webinar recording will be available on the Denver
> FieldOornithologists web site.
>
> Chuck Hundertmark
> Lafayette, CO
>
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Best,

Peter Burke

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Re: [cobirds] Question for the Rail Experts

[mvjo...@gmail.com]

Thanks Nathanwe will have to monitor this and learn what we can. If 
females are not vocal, then we won't easily know if these birds are 
breeding. But lets stay tuned and see how things evolve. Thanks for the 
insight!

John Rawinski
Monte Vista, CO

On Thursday, July 14, 2022 at 11:32:29 AM UTC-6 Nathan Pieplow wrote:

> Good question, John. 
>
> From what I can tell, most of what we know about Yellow Rail behavior and 
> vocalizations comes from the work of Scott Stalheim, who in the early 1970s 
> created a type of outdoor pen in a marsh in Minnesota so that he could 
> observe captive Yellow Rails under conditions that closely simulated their 
> natural situation. He never reported a female giving the clicking song. His 
> sample size wasn't huge, but it would seem that females are unlikely to 
> give the clicking song. In *Rallus* rails, female songs sound quite 
> different from male songs. Stalheim never reported any kind of female song 
> in Yellow Rail.
>
> If there are two rails giving the clicking song at Monte Vista, they would 
> seem to be territorial males. Birds of the World says "In Michigan, males 
> cease calling about mid-Jul (Stenzel 1982), but in Quebec they call as late 
> as 25 Aug (Robert and Laporte 1993)." It will be interesting to see how 
> long the Colorado birds persist.
>
> The San Luis Valley is much farther south than the species has ever been 
> known to breed before. It puts me in mind of the still-difficult-to-explain 
> phenomenon of Baird's Sparrows and even a Sprague's Pipit or two being 
> found singing and nesting along the Front Range in recent years. Have they 
> always been there and we just never noticed? Are they reclaiming their 
> historical range? Or is this some kind of weird southward expansion? Why 
> would ranges expand so far south when the general tendency of climate 
> change is to push ranges north?
>
> If the rails are indeed nesting at Monte Vista, it may be their 
> highest-ever nesting elevation (7600 feet). The highest populations I was 
> previously aware of are at the Klamath Marsh NWR in Oregon, at an elevation 
> of about 4500 feet. Climate change is known to drive species upslope. But 
> upslope-and-a-thousand-miles-south? That's pretty weird.
>
> Nathan Pieplow
> Boulder
>
> On Thu, Jul 14, 2022 at 10:50 AM mvjo...@gmail.com  
> wrote:
>
>> Does anyone know if both male and female make the clicking sounds? You 
>> can see where I am going with this and wondering if this mght be a breeding 
>> pair?
>>
>> John Rawinski
>> Monte Vista, CO
>>
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>>  
>> 
>> .
>>
>

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