A Pygmy-Owl Challenge

Many people think that what we call “Northern Pygmy-Owl” may contain somewhere between two and four species, based on regional differences in vocalizations. Nobody knows exactly where the changes between these songtypes occur, or how abrupt they are, because we just don’t have enough data. Now, my friend Arch McCallum is setting out to get to the bottom of this tricky situation — and you can help. [Read more]