Here is a video of a "wild" crow going thru 8 stages to retrieve a small bit of food ( bird must have been really hungry to go thru all this effort for such a small reward. Or that reward must have been really tasty!). As it is stated in the early part of the video, the crow was familiar with all the components of the trail, but not in this particular order.



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Article: http://www.huffingtonpost.com/2014/02/06/crow-smartest-bird_n_4738171.html