Going on the basis of evolution being true then here is my theory.

As we evolve not all of our advancements have been wise or for the better.

We have succeeded in polluting out air, water, and food supplies. We have succeeded in causing common viruses to evolve to an epidemic rate and a deadly rate. We are driving ourselves to extinction and what will be left is the truly smart creatures...these being the animals, insects and other creatures that can live in nature without destroying everything around it to suit their needs.