Posiedon, whitetail deer are a very prolific species, typically a third of the population can be killed every year and it will rebound back to where it was the following year, twins are very common with whitetails and does can start breeding at 6 months of age. Without some thinning every fall whitetail deer numbers can get out of control in a very short time, much like your prey species of fish in a pond where there are just too few predators in the pond. Like the fish in our ponds, deer are a very renewable resource, personally I think they are much tastier than any of the fish in our ponds. In addition, last week I heard that there had been 276 reported vehicle deer collisions this year so far in Lancaster Co. where Lincoln is located.