Date: 12/30/20 4:55 am
From: Meredith McBurney <Meredith.McBurney...>
Subject: Re: [cobirds] Why Female Red-winged Blackbirds only?
Like Charlie, I did the Barr Lake CBC, and my section was a big open area
north and east of the lake. I found adult males in a couple of marshy
areas and then found a tree-full of females (perhaps some young males....)
in a yard in a more residential area. Sibley says they "often segregate by
sex".

On Tuesday, December 29, 2020 at 12:43:49 PM UTC-7 <charles......>
wrote:

> All males here as well, both along the South Platte in Denver and on the
> Barr Lake CBC. Definitely a mix of young and adult plumaged birds. And
> try as I might none of them could be converted to Rusty's.
>
> Charlie Chase
> Denver
>
>
>
> On Tue, Dec 29, 2020 at 11:12 AM W. Robert Shade III <wrsh......>
> wrote:
>
>> I have as many as 50 or more Red-winged Blackbirds swarming my feeders
>> every morning. Why are they all females? Males do not look like females in
>> winter do they? This means they must spend the winter in different places.
>> If so, what is the rationale for that? I cannot think of any other species
>> that segregates by gender in winter.
>>
>> Bob Shade
>> Green Mountain
>> Lakewood
>>
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>>
>

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