What makes us better than animals?

The main difference is that humans have better-developed brains, our brain is capable of much more complex thought processes. We have the ability to apply what we've learned, are able to communicate with each other and are even able to imagine and come up with new applications for previously learned concepts or ideas. But having said that we're still worst species on this planet.

Us human beings are the worst thing to happen to every living species on the planet, including other humans. As a species, we consume and reproduce without regard to how it affects our local and general environment. We alter and destroy environments wholesale again without regard for the repercussions. We produce waste and dangerous byproducts on an enormous scale.