Of course, given the location of this prank, one does wonder whether or not it's the work of a certain local artist.The human diet is very adaptable to regional crop varieties and personal taste, with some groups able to live almost exclusively on chipped potatoes and sugary drinks.
Groups of humans are often fed by unrelated individuals in exchange for tokens made of paper, metal and plastic -- behaviour which can frequently be seen inside this enclosure.
They're certainly not original: http://www.msnbc.msn.com/id/9087023/ http://www.panoramio.com/photo/9903747
(and I think I've heard about such things way befor 2005)