How did language evolve?

5/1/2012, 4:31:02 PM , duration(0:0:1)
Society & Culture
" Sure animals talk in their own way, with chirps and grunts and the like, but only humans can form words. It is this, some evolutionary psychologists contend, that is what truly separates us from the rest of the species on the planet. But why us?"<br><br> Learn more about your ad-choices at <a href=''></a>