From whale songs to lion roars, animals have evolved to stretch their voices across distances so that friends—and sometimes foes—can hear them. Each sound is coded with messages like "Come here!" "Back off!" "Danger's lurking!" or "Want to hang out?" But why can some communicate over thousands of kilometers, and others mere meters?

From whale songs to lion roars, animals have evolved to stretch their voices across distances so that friends—and sometimes foes—can hear them. Each sound is coded with messages like “Come here!” “Back off!” “Danger’s lurking!” or “Want to hang out?” But why can some communicate over thousands of kilometers, and others mere meters?

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