Vertebrates May Have Used Vocal Communication More Than 100 Million Years Earlier Than We Thought
https://www.scientificamerican.com/article/vertebrates-may-have-used-vocal-communication-more-than-100-million-years-earlier-than-we-thought/
Animals with a backbone may have first emitted something akin to bleeps, grunts, crackles, toots and snorts more than 400 million years ago
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