Bad management. I can attest to what it can do to the deer population in a given area. About ten years ago a man who I had done alot of work for bought a ranch.  It is not a high fenced ranch, but it is big enough that some of the deer that live on it have probably never seen the perimeter fence.  When he bought it I started working out there on a regular basis.  The first time I drove through it I was amazed.  You could almost run over the deer there were so many. They were everywhere.  There were some beauties too.  Many had extremely unique, huge atypical racks.  Apparently the man who had owned it before him had managed his buck population rather oddly but still had done quite a good job of it.  What he hadn't done though was manage the does.  The Wildlife Management official who came out said to start off, to try to kill at least 30 does off the land.  So the owner told me that I could come out and kill as many does as I wanted.  I, his ranch foreman and a couple others tagged out on does the first day out.  You could just walk around and shoot what you wanted.  It, actually, was about as much fun as shooting cattle in a feed lot.  But it needed to be done. (I wish I had known about Hunters for the Hungry at that time.)  Every year he lets me hunt out ther all I want.  All he asks, is that I only shoot does.  I have not done much work out there or hunted there in the last couple of years, but this year I have been back out doing alot of work again.  I decided to take a ride and scout around some.  I was saddened by what I saw.  Which basically was nothing.  Over the past few years his sons and grandsons have been going out there, and with the help of their friends have decimated the deer population.  The ranch foreman says that they get out and just shoot up everything.  Every time they showed up, he said, it souned like a battle front out there. He says that he hardly ever sees many deer now.  Whereas you used to see fifty in the oatfields at any given time, now there are some days you don't see any and when you do its just a couple of does. It is scary what just a few years of bad management can do to a really healthy deer population.