Sumichrast’s Wren and Nava’s Wren are both sooty-brown songbirds of southern Mexico. They both live in tropical forests where limestone outcrops provide a natural amphitheatre to show off their vocal feats. Yet the two have very different songs and are never found in the same place. Though scientists once thought they were the same species, genetic studies eventually proved that the two wrens are distinct — each with their own way to serenade their forest homes.

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Humans and songbirds are among a small group of animals that can learn to imitate the sounds we hear. It’s an ability called vocal learning that makes language possible. Scientists who study human speech often start with birds that share our vocal learning skills, says neurobiologist Erich Jarvis. On Bring Birds Back, Erich discusses his research into the evolutionary origins — and unexpected benefits – of vocal learning for people and birds.

Listen to the full episode with Erich Jarvis in season 7 of Bring Birds Back!

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Trumpeter Swans are among the world's largest flying waterfowl. They can weight up to 25 pounds and have a wingspan of nearly seven feet! These swans migrate in family groups each fall from nesting sites in Canada and Alaska to wintering grounds in the central U.S. Trumpeter Swans are sometimes accompanied by their smaller cousins, the Tundra Swan. Both swan species look similar to each other, but their voices are distinct!

More info and transcript at BirdNote.org.

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