There is a study by researchers at the University in Landau, lead by Dr. Kuhn. A detailed description is available here
http://agbi.uni-landau.de/material_download/elmagexp_bienen_06.pdf
Unfortunately, it is (except for the abstract) in German. You find a discussion of it here
http://backreaction.blogspot.com/2007/04/einsteins-bees.html
Don't miss the comments.
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