A smaller bear can also be quite dangerous.
About a month ago in the Ozarks, an older gentleman was working on his tractor alongside the road. A young black bear weighing about 70 lbs attacked and badly injured him.
Luckily the man's son arrived on scene, and got the bear off him. The bear was killed by wildlife officers.
There are conflicting reports as to why the bear attacked, from an unprovoked one in the news, to some that the man had actually been feeding the bear.