An environment worker weighs a blackbird in Albufera's Natural Park near Alcudia at the Spanish Balearic Island of Mallorca March 14, 2006. The International Monetary Fund on Monday warned that a severe Avian flu pandemic would likely cause significant harm to the world economy with widespread disruptions in workplaces, trade and payment systems, and prompt a surge in demand for access to money. REUTERS/Dani Cardona