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...@gmail.com 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...@gmail.com> 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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