Apes still smarter than thought

Two recent articles on the BBC website have pointed to further advancements in the understanding of ape intellegence. Orang-utans, not one of the most social of great apes, still seem to be social enough to have developed regional cultures, everything from making a bronx cheer before sleeping to riding falling dead trees for the excitement. And like human cultures, once these groups are seperated, or extinct, the culture is gone too.
A group of researchers is claiming a pygmy chimpanzee they work with is talking. Well, not in full phrases, but the ape, kept as part of a linguistics group, has been noted making distinct sounds to accompany things like 'yes' or 'banana.' Given that he'll say the same sounding 'yes' whether happy or angry, it seems to be a case of spontanious vocal development, something thought not in the range of chimps.