Let’s be honest: koalas are biological dead ends. They spend 20 hours a day sleeping because their diet of eucalyptus leaves is so low-energy it barely keeps them alive. Those same leaves are toxic, but instead of finding a better snack, the koala evolved a specialized gut just to process poison. To top it off, if you put eucalyptus leaves on a flat plate in front of them, they won’t recognize them as food. They lack the cognitive ability to understand that food is food if it’s not attached to a branch. Cute? Maybe. Useless? Absolutely.