FacebookMail Ahana Fernandez trekked through the rainforests of Central America, ears tuned for high-pitched, repetitive chirping and squeaking from greater sac-winged bat pups. Their babbling may shed light on why human babies babble and the origins of speech. If you like this article, please sign up for Snapshot, Portside's daily summary. Email (One summary e-mail a day, you can change anytime, and Portside is always free.) Leave this field blank Science biology Evolution
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