We know that chimpanzees and some other creatures can recognize themselves in mirrors — "self" as opposed to "other." They have a sense of humor, and these are the kind of things which traditionally have been thought of as human prerogatives.
Sabemos que los chimpancés y algunas otras criaturas pueden reconocerse en los espejos — diferenciarse de otros. Tienen sentido del humor, y este tipo de cosas que tradicionalmente se ha pensado que eran prerrogativas humanas.