I was so busy pretending to speak like a chimp on Monday that I completely forgot to mention this brilliant part of the behind the scenes documentary.

It's a rare treat to find a 30 minute making of special feature as engrossing - and moving - as a DVD's main release, especially when it includes a chimp sign language chart.

So here it is, in case you need another reason to buy the awesome Project Nim on DVD:

If you're still not convinced (and you should be - it's one of the best documentaries of the year), read our Project Nim DVD review.