Humans seem to acquire language in a manner different from other types of behavioral learning.
We learn our native language without instruction, in fact, we can learn 2-3 languages at that age as easily as one. If we do not learn to speak between the ages of 2 and 6, it appears that we lose the ability to speak normally the rest of our lives. All this evidence suggests that we have a 'language organ' which other species do not possess, a segment of our brain which is triggered by a stage of development, much the same as walking is. A simple way to disprove this Innateness Hypothesis, as linguists call it, is to demonstrate that other species have the capacity to speak but for some reason simply have not developed speech. Chimpanzees cannot speak because, unlike humans, their vocal cords are located higher in their throats and cannot be controlled as well as human vocal cords.