Date: 12/29/20 11:43 am
From: Charlie Chase <charlesachase3...>
Subject: Re: [cobirds] Why Female Red-winged Blackbirds only?
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 <wrshade3...>
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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