This is going to build a bit more on my previous post "Naturalism and Human Equality". Naturalism demands that all living entities be ascribed equal value.This includes bugs and plants. Why should we ascribe greater value to humans? Why not whales, because of their size, or certain trees, because of their long life-spans? If evolution is to be used as a guide, then we must conclude that survivability is the ultimate ascription for value. We could look at survivability of an individual or of an entire species, and we still would not conclude that humans are on top, though.