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 >> >> -- >> > You received this message because you are subscribed to the Google Groups >> "Colorado Birds" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to cobirds+<u......> >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/cobirds/CAFwvYHrG0Sm6E9%<2Bv9Lrbu2ttFZCwhoSgZWjzH9CFQFfWnuGgpg...> >> <https://groups.google.com/d/msgid/cobirds/CAFwvYHrG0Sm6E9%<2Bv9Lrbu2ttFZCwhoSgZWjzH9CFQFfWnuGgpg...>?utm_medium=email&utm_source=footer> >> . >> >