Here's an excellent look at a successful winter hunt by a red fox. This technique is known as "mousing," broadly defined as the act of jumping high in the air above its prey - in other words, an aerial assualt by a terrestrial animal! In conditions that allow foxes to see their prey, their acute vision is considered primary to a hunt's success. But in conditions like these, where prey moves underneath the cover of snow, hearing becomes much more important in procuring meals. A 1998 study in the