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I wonder what it is about his design that requires an opposable thumb? Maybe like a vertical rod you'd have to grip and pull down?

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Likely a lid that requires pressure on two opposite faces to open- a bit like the kid proof pill bottles.

Couldn't a raccoon work around that limitation by placing two paws on opposite sides of the mechanism and squeezing?

Unless the mechanism requires two hands with opposable thumbs (four points of pressure)... in which case two raccoons could work together and share the spoils.

Here's the design article.

http://www.thestar.com/news/gta/2014/08/26/toronto_designer_...

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