Melodies of Singing Birds: Result of a Rare Evolutionary Event

Over millions of years, sound production was taken over by the syrinx, possibly because the syrinx was much better in producing varieties of sounds.

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Melodies of Singing Birds: Result of a Rare Evolutionary Event

Hybrids: Evolution in action?

Birds with more complex vocal skills are better problem-solvers

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Vermilion flycatcher - Wikipedia

What did dinosaurs sound like?

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These songbirds sing for hours a day to keep their vocal muscles

These birds 'retweet' alarm calls—but are careful about spreading

Ancient Birds Avoided Mass Extinction By Shrinking

Birds that dive may be at greater risk of extinction

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Meet the Tanabeak, an Extremely Rare Tanager–Grosbeak Hybrid