Thanks all!
For the record, I was not aware of the split and was just curious about how it would be resolved in eBird. I'm happy that my ABA list is one higher!
Best regards,
On Tue, Oct 27, 2026 at 3:10 PM Nathan D Pieplow <Nathan.Pieplow@colorado.edu> wrote:
I can second what Andrew said. I've never recorded an Eastern Marsh Wren in Colorado. Marsh Wrens can sing a lot on migration, but unfortunately they're usually singing run-on plastic songs that are harder to ID. We'll need good recordings (probably long ones) to confirm an Eastern Marsh Wren in the state.
Nathan
Nathan Pieplow
Teaching Professor & Student Affairs CoordinatorProgram for Writing and RhetoricUniversity of Colorado, Boulder
From: Tom Behnfield <behnfield@gmail.com>
Sent: Tuesday, October 27, 2026 12:36 PM
To: Josh Bruening <87211jjb@gmail.com>
Cc: Peter Gent <gent@ucar.edu>; Nathan D Pieplow <Nathan.Pieplow@colorado.edu>; Colorado Birds <cobirds@googlegroups.com>
Subject: Re: [cobirds] Marsh Wren vs Western Marsh Wren[External email - use caution]
On Tue, Oct 27, 2026 at 12:35 PM Josh Bruening <87211jjb@gmail.com> wrote:
Tom,
This should resolve itself unless during certain times of year Marsh Wren has traditionally been flagged as rare anyways. The default wren in this new split for Colorado will be Western Marsh Wren. The new Western Marsh Wren will assume the existing filter limits for each filter region. There are no confirmed records of Eastern Marsh Wren in Colorado on eBird and if memory serves me correctly, there are no CBRC records either. Maybe @Peter Gent can confirm this. In some recent communications with Andrew Spencer on our Colorado eBird review Slack channel he said:
"Back when I was living in Colorado, I did spend a significant amount of effort trying to find an EMWR in the state, inlucing recording birds in the eastern tier of counties, especially during migration. While I found a couple of birds that visually looked intriguing, every single one I recorded proved to be a WMWR. It does seem quite likely that EMWR is a very rare migrant on the eastern plains, identifying silent birds is complicated. So getting recordings (if possible) of any potential EMWR would be vital!" (posting this with Andrew's permission).
Reviewers will be essentially requesting the same level of media/recordings for confirmation on eBird that we were looking for with the recent Warbling Vireo split. @Nathan Pieplow -perhaps you could weigh in on your experience with these now two separate species? Feel free to keep the questions coming!
Bird is the word!
Josh BrueningFort Collins
Greetings all!This morning I began getting Colorado Needs Alerts for Western Marsh Wren. Will this resolve itself or is there some action I need to take?
Good birding!
Tom BehnfieldLakewood/Jefferson County--
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