[mou-net] White-breasted Nuthatch Question (Female)

[Stan - Molly Jo Miller Johnson]

I have a pair of White-breasted Nuthatches building a nest in the fascia of our 
house, the same place as the last two years. In addition, a pair built a nest 
three years ago in a tree in the same general area. The female in the previous 
years had a very dark gray cap. It was so dark that it could really only be 
detected if you saw her from the top so you could compare it to the black on 
her neck. The female this year has a very "normal" gray cap. 
Could this be the same female? Does anyone know if their caps can get darker or 
lighter throughout their lives?
Thanks,Molly Jo MillerInver Grove Hts, Dakota Co.                               
          
----
Join or Leave mou-net: http://lists.umn.edu/cgi-bin/wa?SUBED1=mou-net
Archives: http://lists.umn.edu/archives/mou-net.html