Imagine a highly evolved alien world in which the exponential change is so rapid that in a day (by way of colonization, inventions, exponential births etc), society changes more than in all of its previous history since their species climbed down off the trees. And every day after it goes faster still. Due to exponential growth, humanoid beings like humans must be the NORM in the universe. Not animals like snakes, birds, rats, horses etc. There´s probably 99, something% star trek like beings in the world on two legs using tech etc, and less than 1% animals. We´re contained on earth somehow to make us miss this (highly probable) fact.