Language requires ability to manipulate symbols that and is so complex that even the most pampered and tutored chimpanzees barely manage any of it. Learning the spoken language is as 'natural' as learning to walk . Watch babies as they struggle hard to crawl, stand up, walk, run, despite the tumbles. Listen to them as they struggle as hard to to practise sounds, babble, to get their tongues round words, to express their ideas, and to understand the blooming buzzing confusion of voices around them. But speech is different from walkin g in an interesting way.
Language is a human invention.
When babies learn to speak, they are learning a human invention. Since language and speaking capacities seem to be built into the human brain, just like our instinct for moving around, it was once supposed that the language itself was built in too. A child left to itself would speak 'naturally', and its natural language would be the original pre-Babel tongue. King Frederick of Prussia even tested the common hypothesis that this language would be Hebrew, since this was supposed to be the language of the Garden of Eden. He had a baby brought up isolated from all human language contact.