Zebra Finch (IMAGE)
Caption
University of Utah scientists studied the colorful zebra finch to learn more about the factors that allow the songbirds to sing over a wide range of frequencies while females utter only brief lower-frequency calls. They found that the males' more powerful vocal muscles were much more important than the pressure of air within the lungs.
Credit
Nataliia Verzhbitskiy, University of Utah.
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