It's National Mother Language Day. Many of the world's thousands of languages are spoken, written and/or signed... and at least a few are whistled. Plus: researchers say they've found evidence of the largest penguin species that ever lived. 
Just Put Your Lips Together and Blow: How Whistled Languages Work (HowStuffWorks)
Nearly extinct whistling language revived (CNN via Archive.org)
The largest penguin that ever lived (University of Cambridge)
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