Koala
Now ignore the fun facts for a moment and just look at the brain you find inside of a koala bear. It is completely smooth and reminds us of some type of jellyfish. Well, this interesting-looking brain gives us an insight into the cognitive power of the koala bear, which is not very much.
It would appear that they are actually a little bit on the dumb side of the animal kingdom. They don’t know what to do with the same leaves they eat if they find them on the ground and not attached to a tree. It is okay though because in the end what they lack in brains makes up for cuteness and lovable faces.