On behalf of Grace who sent in an email:-
There is a bird in my backyard that is different than any I have ever seen. It is a little larger than an Eastern Phebe and built similar but it's wings look kind of like a sparrow, brown with dark bars on wings but under the wings, back and tail is blue so when it flies it is quite noticable.
I have looked in my Audubon North American Bird book and can't find anything like it.
Can you help? Thanks so much for any help you can give me.