Different peculiarities of fossils found in different periods of time can give researchers different evidence of the level of brain development and activity connected with it. Language is a result of brain activity and work of vocal apparatus, that is why it is possible to judge its development based on fossils. For example, the state of the hypoglossal canal can give a good image of the verbal abilities of our ancestors. Moreover, the reduction of jaws and teeth also resulted in the appearance of the ability to talk.