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Scientists have discovered that songbirds, like humans, learn to make sounds by copying what they hear.
Songbirds and humans have a similar brain structure for learning sound, say researchers at Rockefeller University.
Scientist Erich Jarvis formed a hypothesis that molecules guide brain connections that create paths to the voice box, permitting the copying of sounds.
A hypothesis is an idea or theory that is not proven.
Forming a hypothesis is the first step in the scientific method.