Great Smokey Mountains
Can't answer about bluebirds,or most other kinds -- some kinds the male and female have different colored feathers and sometimes the females are smaller. Maybe you'll have to wait and see who sits on the nest.
I'm not sure about the birds either, but I think I've read that the female is the less colorful of most species. I did want to stop over here and say thank you for visiting mine! I loved reading your "About me" section. What a lovely life... and I adore the grand kids calling you "Lollypop"If you'd like to play along, I'd like to pass along the "Stylish Blogger" award I just received. And if not, that's ok too... thanks for coming by, I hope you keep visiting!
Certainly as I do like to read your blog.