A dramatic mid-air battle between a marsh hawk and a short-eared owl was captured by photographer Henrik Nilsson.The hawk swooped down on the unsuspecting owl, who had just captured a vole, a small rodent.Nilsson explains how he witnessed the scene towards the end of his day in the field.The bottom photo shows what looks like a face of rage and disgust on the owl, as the hawk successfully steals the meal, and flies away.