By late January, some resident birds, such as the Northern Mockingbird, are beginning their spring singing. When you step outside on a particularly sunny day this winter, a Fox Sparrow like the one pictured here may be warming up for the coming spring. And as far north as British Columbia, Pacific Wrens are singing in earnest by mid-February. So the singing season never entirely stops.

More info and transcript at BirdNote.org. 

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