Be sure to keep an ear out for the clear, sweet whistle of the male white-crowned sparrow song (females also sing, but less so) in wintera time when many other songbirds have stopped singing.

The white-throated sparrow has a dark bill, prominent white throat, and yellow supraloral. Immature simi­lar to immature golden-crowned, but note the latter’s dark gray bill, indistinct head ...

The white-crowned sparrow, which has distinctive white and ... creating a rare historical record of song behaviour. It's well known that birds living in cities have had to adjust their songs ...