According to the experts at bioexpedition.com, the Malayan sun bear is the meanest of all bears. The species is native to the rainforests of Southeast Asia.
Surprisingly, the sun bear is also the smallest of the eight bear species found across the globe, with the average adult weighing just 60 to 145 pounds. While the bear is omnivorous, it possesses extremely large claws, a strong jaw and teeth comparable to those of lions and tigers. The bear is exceptionally aggressive and will attack humans without cause, though the reason for this nature is not fully known. Sun bears live in small groups, while other species tend to live alone.