Mill's writings defines pleasure as avoiding pain. He goes on to describe pleasure as taking form. These forms can consist of "beauty, of ornament, or of amusement" (Mill,1863). Pleasure is ranked lower if the pleasure is primal like sex or eating, higher ranked pleasures are more intellectual. If you choose between reading the Odyssey and spending time eating a cake you are choosing between high and low pleasures. Animals are able to only have lower pleasures they do not debate with other animals. Pigs are not writing a dissertations, they are rooting around in mud and eating. Humans have the power to decide that they would rather compose music than indulge in animistic wants.
The extent I think about what I want to achieve
The extent I think about what I want to achieve