MILWAUKEE, Wis. -- Louis Volpe, acting regional supervisor of the U.S. Department of Agriculture's safeguarding intervention and trade compliance program, holds two Giant African Land Snails in the USDA's Milwaukee office. Federal health officials have seized several of these dangerous pests from Wisconsin classrooms and have started a national search for the creatures. Many of the snails, which are illegal to possess in the United States, were being used as teaching tools in some classrooms where school officials don't know they are dangerous, said Willie Harris, eastern regional director of the USDA's intervention and trade compliance bureau. (04/21/04 AP photo)