Bears often use rocks or trees as part of their grooming routine to remove loose fur, dislodge parasites, or relieve itches caused by insect bites https://t.co/52rJ8eRmG3 https://video.twimg.com/ext_tw_video/1846821063323213825/pu/vid/avc1/720x900/-ZroKxRyaYtIigmn.mp4?tag=12