No surprise to anyone that a certain percentage of Americans are out of touch with reality. I guess if it's life or death: Easy: Rat Cat Goose Tough, would have some scars: Dogs Wolf Kangaroo Maybe, definitely come out hurting: Eagle (those talons could kill you fast) Cobra (timing) Longshot, dirty fighting, come out crippled, depending on size: Crocodile Gorilla No ****ing way: Lion Elephant Grizzly Bear
Key part of question is 'unarmed' meaning you only have your body, not even a rock. Attention to detail isn't a big proponent of many Americans, either.
Ha! Welcome to middle age, mother****er! Stretching, exercise with proper posture and proper breathing, good diet, including less booze, are your friends.
Part of the problem with fighting the little animals is getting the little animals to stand their ground and fight back. From experience, I can't win a fight with a domestic cat, because I can't catch the little ****ers. They're all about hit and run tactics.
Fun thing about bears is that they don't kill you in a fight, they don't care if you're dead or not, unlike other predators. They'll just start eating you while you're alive.