Some people just won't shut up. That's probably been true for a long time—maybe even hundreds of thousands of years.
Computer reconstructions of ancient skulls (头骨) show that our ancestors had ears built like ours as far back as 350,000 years ago. The ears of social mammals(哺乳动物) are typically designed to recognize sounds made by fellow species members. 'So, humanlike ears suggest humanlike speech', say researchers from Spain.