I've never seen a Gray Vireo, but this is a great sighting and info. Thanks 
for sharing, all! 

- Jared Del Rosso
Centennial, CO

On Thursday, May 28, 2020 at 6:48:30 AM UTC-6, lynn wickersham wrote:
>
> We have studied Gray Vireos for over 10 years and have monitored hundreds 
> of nests. We frequently find nests with sitting, singing males but have 
> never observed females singing on nests. While females do sometimes sing a 
> few notes, as we've observed it this behavior generally seems to occur also 
> when their mates are singing, as sort of a courtship ritual and/or contact 
> call. Sometimes they sing some notes and also squeaky calls and their 
> distinctive trill prior to copulation. When they do sing, it is usually a 
> few notes at a time, noticeably different than the males, with softer, 
> shorter notes, and not nearly as extensive or melodic as the males. 
>
> Lynn Wickersham
> Durango
>
> On Wednesday, May 27, 2020 at 4:54:10 PM UTC-6, John D wrote:
>>
>> CO Birders :
>>
>> While visiting my son in New Castle this past weekend , I took the 
>> opportunity to do an early morning visit to Cameo and Coal Canyon in Mesa 
>> county before it got too hot and the motor bikes and ATV's started up.
>>
>> I did get to see and photograph Chukar my target bird , male and female , 
>> they seem to have moved much further up Coal Canyon than previous years , 
>> probably because of the active shooting range in the lower part of the 
>> Canyon.
>>
>> And I did find a Gray Vireo nest in juniper in Coal Canyon , took me over 
>> half an hour to find it , could hear the bird singing but just could not 
>> see it despite being only 6 feet from the sound . So eventually I found the 
>> nest and the bill of the vireo just poking above the rim of the nest . My 
>> question is what sex was this bird , can both male and female vireos sing 
>> the same song from the nest ?. It was singing the same song as on Sibley.
>>
>> [image: IMG_3809.1jpg.jpg]
>>
>> John Drummond
>>
>> Colorado Springs  
>>
>

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