Get enough testosterone in a small area and there's bound to be some horseplay. For example, take a look at a recent video from Utah showing two mule deer bucks playing King of the Hill. After a third buck joins the ruckus, one of the deer launches several feet into the air. At first, the deer looks like it went airborne under its own power. But after another look in slow motion, it's possible he received a boost from his opponent. What do you think--was it a jump or a lift?