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Animal rights activist from the group 'Animal Equality' are covered with plastic sheets to represent meat packaging as they stage a protest during "Day Without Meat" event in Barcelona, Spain, Wednesday, March 20, 2013. (AP Photo/Emilio Morenatti) ( Spain Day Without Meat Protest )

An animal rights activist cuts into a plastic sheet with a pair of scissors during a protest against meat consumption at a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )

An animal rights activist protests against meat consumption through a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )

An animal rights activist from the group 'Animal Equality' lies in a tray representing meat packaging during a protest to celebrate the "Day Without Meat" event in Barcelona, Spain, Wednesday, March 20, 2013. (AP Photo/Emilio Morenatti) ( Spain Day Without Meat Protest )

An animal rights activist protests against meat consumption through a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )

An activist from the animal rights group "Animal Equality" poses in a giant meat packaging tray at the Cathedral square in Barcelona on March 20, 2013 during an event to mark global meat-free day. LLUIS GENE/AFP/Getty Images ( 518313338 )

An animal rights activist protests against meat consumption through a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )

An activist from the animal rights group "Animal Equality" poses in a giant meat packaging tray at the Cathedral square in Barcelona on March 20, 2013 during an event to mark global meat-free day. LLUIS GENE/AFP/Getty Images ( 518313344 )

An activist from the animal rights group "Animal Equality" poses in a giant meat packaging tray at the Cathedral square in Barcelona on March 20, 2013 during an event to mark global meat-free day. LLUIS GENE/AFP/Getty Images ( 518313349 )

An animal rights activist protests against meat consumption through a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )

An animal rights activist protests against meat consumption through a performance to promote vegetarianism during "Day Without Meat" in central Barcelona March 20, 2013. REUTERS/Albert Gea ( SPAIN/ )