Cobirders,
 
Here is a link to a comparison of the two wren's songs on Nathan 
Pieplow's Earbirding.com website:  http://earbirding.com/blog/archives/1897
 
Good birding,
 
Steve Stachowiak
Highlands Ranch, CO 

On Thursday, October 16, 2014 12:31:15 PM UTC-6, Steven Mlodinow wrote:

> Greetings All 
>
>  The breeding distribution of Eastern Marsh Wren reaches west to cen. NE, 
> cen. SD, and I believe, ND and Alberta. 
> Given that we have so many records of other eastern birds with an even 
> more easterly distribution, it seems rather unlikely that Eastern Marsh 
> Wrens DON'T occur in CO. I guess that is a double negative. It seems highly 
> likely that Eastern Marsh Wrens DO occur in CO. The problem is that the 
> criteria for sight ID are not entirely clear, though the songs are very 
> different. So... even a very careful and experienced birder will not likely 
> identify a member of this subspecies group unless that bird sings. 
>
>  Good Birding
> Steven Mlodinow
>

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