I had a cat that tried to do that for a while. She had figured out that opening doors had something to do with grabbing the knob, but she was never able to turn it. (I suspect that in this case, the door wasn't closed properly, and just needed a bit of a shove.)
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Combine that with the recent news of Octopi using tools for armor and disguise, and we're in big trouble:
http://news.nationalgeographic.com/news/2009/12/091214-octopus-carries-coconuts-coconut-carrying.html
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