This is one of the ways to see if the deer population exceeded the area. There can be about 10 deer per acre, but in some areas, mostly urban parks, there are as many as 25. During summer it is usually not a problem, however by winter deer overgraze the area, by eating gras, twigs and bark and literally starve to death. The numbers differ depending on area vegetation and retain features. Normally, wolves keep population in balance, but since we killed them off, deer have no natural predators. Cars do kill some deer, especially at night and rain.
The rangers figure out the correct deer density and set the hunting quota for the fall.
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