Creativity is the truly unique feature of Homo Sapiens. It’s not intelligence (even a thermostat can be said to be intelligent) and it is not consciousness (probably most primates and maybe mammals have some kind of consciousness), two “things” which incidentally are also very difficult to define and to study: it is creativity that makes the difference, and creativity is easier to measure and study.
What makes us so much more creative is an innate impulse to be different from previous generations. Humans are the only species whose children “rebel” against the lifestyle of the parents. In all other species the children live the exact same life of their parents. Humans are the only ones whose lifestyle changes in almost every generation.