White-throated Sparrow

Zonotrichia albicollis

Appearance:
Medium-sized sparrow
Rusty-brown striped upperparts
Two white wing-bars 
Grayish underparts
White throat 
Black and white striped crown
Black eye line
Yellow lores (spot between eye and bill)

Listen to its call.

The White-throated Sparrow comes in two forms: white-crowned and tan-crowned. On tan-striped birds, the white and black crown is replaced with tan and brown. In addition, the white throat is split in three sections by dark streaks descending from the bill.

Here's an interesting fact that I came across in my reading -- males of both morphs prefer females with white stripes and both morphs of females prefer tan-striped males.

Learn more about the White-throated Sparrow.