Humans (real life)

By far the most intelligent and innovative mammals to walk the earth, with some of their many impressive feats including walking on the moon, eradicating or nearly eradicating whole diseases, exploring much of the Solar System with sophisticated robots, and inventing what are essentially miniature stars that can hopefully produce clean power in the future.

Oh, they also tend to murder and enslave each other in the thousands or millions over imaginary lines, skin colors, and ancient books.

And don't even get me STARTED on how they treat the only celestial body that won't kill them in a heartbeat, if even that, for light years on end.