You know, we wrote the 1776 Declaration for a reason...
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
http://www.archives.gov/exhibits/charters/declaration_transcript.html
Superiority is not an actual thing, but a value imposed by humans. Natural selection doesn't favor "superior" organisms, only organisms that are able to reproduce.
Everyone is born equal... With inequality imposed upon them. There is no chain of being in nature.