Identify the most appropriate summary for the paragraph.

Vocal learning might involve imitating sounds or producing completely new vocalizations. Nearly all mammals on Earth make some vocal sounds, and the vast majority are born with innate abilities to do so. But humans are not: We need to learn how to speak. While many studies over the past century have helped explain how we understand language, the mechanisms behind how we process and learn to make the sounds that allow us to express language are not well understood. So, it is important to understand the neurobiological mechanisms underlying vocal learning and language acquisition in mammals as vocal learning plays an important role in language acquisition.