Desires Vs Needs

What differentiates animals from human beings.Is it the better evolved cognitive intelligence.Yes of course but what has been the effect of this cognizaince...Desires and efforts to attain those.But these exceed what is necessary for a basic living.Comparing men Vs animals,animals hunt just to feed their hungry stomach but humans may kill just as an entertainment.So where does one draw on the line.......thats a point to ponder.....