You Made a Bear That Only Eats Poison?Evolution created a marsupial with no energy and a smooth brain.

From the show

Oh, god... really?

Koalas sleep 20 hours a day because their diet of eucalyptus leaves offers almost no nutrition and is toxic to most other animals. We ask why an animal was designed to be high on poison and too stupid to recognize food if it isn't attached to a branch. It is a survival strategy that barely survives.