It's amazing how instinctively they know how to react. Last week I had two button bucks come into me at the edge of a field and bed at 15 yards. They were great company for the evening hunt. They'd get up and mill around so I decided to tease them with calls just to get their reactions. I grunted and contact called to them occassionally and they'd look intently for this deer but at one point the one little button urinated and even rubbed his tarsal glands together....I had to smile and thought, 3 years little guy, 3 years.