The threat of being eaten could drive the march of Mormon crickets as they munch their way across millions of acres in the arid West, new research suggests.

• 新调查显示:因受到自相残杀,被互相吃掉的威胁,摩门蟋蟀的行进队伍浩浩荡荡,啃吃完美国西部旱地上几百万英亩的植物。