Kanzi the bonobo demonstrates language recognition, and shows his understanding of intentions while playing with the narrator.
Sue Savage-Rumbaugh and noted linguist and all-around smart guy Steven Pinker disagree on the nature and depth of Kanzi's (and apes in general) language abilities, but it would seem to warrant further study.
Kanzi, and his compatriots Matata and Panbanisha, have demonstrated remarkable intelligence throughout their lives. Check out the Wikipedia link for more.
From the BBC Documentary "Chimps are People, Too".
More Information:
http://en.wikipedia.org/wiki/Kanzi
http://en.wikipedia.org/wiki/Sue_Savage-Rumbaugh
http://www.bbc.co.uk/sn/tvradio/programmes/horizon/broadband/tx/chimps/
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