We often marvel at the unexpected strategy and moxie displayed in animal-on-animal brawls. Yet even in the animal ranks, there are clearly weight classes that tend to determine the outcome of Mother Nature's clashes.

Perhaps that's why a recent video, which features a house cat with a death wish defending its home from a bear, is so amazing. Of course, the bear is smartly focused on its goal of grabbing a bag of trash. Still, you've got to be impressed by the feline's ability to send his sizable foe on its way ...