Most of us cut our teeth deer hunting. The fact is, whitetails are favored among sportsmen because they are abundant, accessible and a challenge to hunt. North, south, east and west, hunters of all ages pursue this enchanted ungulate each fall. Despite the wealth of information available in all sorts of media - whitetailed deer remain among the most mysterious animals known to hunters; and if you're fortunate enough to take a true trophy of the species well, that's an accomplishment. From biology to strategy, following are 20 things every deer hunter should know before entering the woods.