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Not single sex, but a mixture of adult females and immatures of both 
sexes.  This is typical of pine grosbeaks not just this winter but every 
irruption.  The males mostly stay back on the breeding grounds.

(We had that discussion here, too)

Jane


On 1/21/2013 5:52 PM, Thomas Rhindress wrote:
> To the original poster, I believe there was some discussion earlier in
> the season on NYSBIRDS regarding this question about single sex flocks of
> pine grosbeaks.  From what I remember of the discussion, single sex flocks
> are the norm this winter and very few adult males have been sighted in the
> Northeast.
>
> Tom Rhindress
>
>