New information on how birds sing

After discovering that my blog is not censored in China, I was even happier to come across this article from LiveScience discussing how songbirds make their beautiful songs. "X-ray movies of a singing northern cardinal reveal that the bird rapidly changes its vocal tract shape—from the simple shape of a drinking straw to a voluptuous flower vase—to give the song some flavor". The article also includes a video of a 360-degree view of a cardinal's vocal tract while singing. Now there's something you don't see every day.