Dunn and Garrett in Warblers mention for HY fall females the lack of black on back and sides of throat. paler overall. Probably harder call is adult females from 1st fall males.
> On Nov 15, 2020, at 10:54 AM, Andy Thomas (Redacted sender adt0611 for DMARC) <dmarc-noreply...> wrote:
> Is it possible to determine the sex of immature TOWAs in the field this time of year? Last year I thought I had males and females at about 1:2 ratio. Later in the season I began to see some of the "females" molt into male plumage. I'd like to get it right the first time if possible.
> Andrew Thomas
> West Linn (Clackamas)