Hunter: Hunters alone are blamed for the decline in Greenrock National Forest' s deer population over the past ten years. Yet clearly, <b> black bears have also played an important role in this decline </b>. In the past ten years, the forest' s protected black bear population has risen sharply, and examination of black bears found dead in the forest during the deer hunting season showed that a number of them had recently fed on deer.
The main conclusion of the hunter's argument is that the boldface portion.