Some animals are built exclusively to survive. Take certain species of spiders, for instance. We have already made it quite clear that the male will be eaten post-fertilization because he has absolutely no purpose in life. At all.
But we have yet to bash the role of the female. Mothers in some species, after giving birth, offer their bodies as a form of sustenance for their offspring. So, similar to the father (who only wanted to ensure the survival of his descendents), the murderous mother has only one purpose: the survival of the species.
Thus, these animals are only built to survive, nothing more. Humans are different in that we seek pleasure, innovation, love, etc. Spiders have been building the same/similar webs since the origins of their species (save for Charlotte from Charlotte's Web, of course).