unethical is one inch farther than you know you will hit where you want to, from past practice and experience, and knowledge of current conditions.

I don't know that humans can make an unfair advantage. A leopard uses all its skills and equipment the best it can, every time. A human should too. We don't have sharp teeth, fast, silent running, a sense of smell at all, jumping ability, or any of the other things a leopard (or wolf, shark, etc) uses, so we use our ability to make products to help us and communicate teachings about how to use them.