Please answer me this, the most answers I can get, the better....?

Why is it that if we kill a couple of bald eagles, they go on the endangered list, but yet we kill cows like it's going outta style and and we're yet to see a depletion on the cow population. What's up with that mang!!?? When was the last time you heard of a cow on the endangered list? It would be like hearing about Prez. Bush winning a Noble Prize in astro physics.