根据一篇英语文章创建一个简要的摘要。
All animals communicate, but only humans communicate with language, with its complex grammar and syntax. So how did language evolve, and when? Researchers long believed that language was one of the last great leaps taken by our species.
Animals communicate, but only humans use language with complex grammar and syntax. The evolution and timing of language have long been debated, with some researchers believing it was a recent development for humans.