As an evolutionist biologist, Dawkins has commented on some non-biological fields of knowledge such as ethics. Regarding ethics, he has utilized different areas of knowledge like social biology, evolutionary psychology, genetics etc. The most important aspect of Dawkins theory is that he negates any form of moral distinction between human and animals. His concerns about dealing with ethics originate from the motivation to negate the ethical functions of religion. In addition, according to the fact that evolutionary theory fails to explain the morality of human, and considering this as one of its flaws, Dawkins attempts to resolve this problem in one way or another. This paper is an attempt to analyze and report Dawkins’ attempt.