Chimps: Language and Tools

I must say I am not surprised in the slightest that chimpanzees have a language. Who would think the grunts and noises would be meaningless?! The association of particular pitches based on particular foods is quite interesting, as it allows researchers the ability to discern the language they utilize. What the significance may be? I can't say I know for sure. The article claims this is special because "it provides the first evidence that listening chimps are sensitive to this variation..." Well, great.