10 Dumbest Animals in the World

Koala

The Koalas have the smallest brain-to-body ratio among animals. These cute animals are found in Australia. The koalas had to develop four stomachs to digest their favorite food, which is eucalyptus leaves with little nutrients. And they know nothing about health. According to an estimate, about 90% koalas have chlamydia. Sometimes they even fail to recognize their own food, and eventually starve to death.