The Mysterious American Tree Sparrow

A frequent topic of discussion on this blog is what we don’t know about bird sounds. Another favorite topic is how amateur recordists might help solve mysteries — and advance science — by recording common birds in their own backyards. Now, as most of North America languishes in the middle of a deep, dark winter, I’d like to point out a golden opportunity for citizen science — a chance to answer questions about a bird that many people know, but few really understand. [Read more]