We can usually classify each of our fellow humans somewhere on the scale between Ugly and Beautiful. Not so with Nature. It is difficult to find any examples in the natural-world that can be considered ugly. The colors, are perfectly matched and blended; the shapes are perfect, even if non-symmetrical; the composition is perfect. There is some magic at work here.
If we try to draw or paint Nature, it can end up a real mess. For example, ask a child to draw a tree without its leaves -- at best, the result will look awkward. If we build something that does not have an exact symmetry, it looks a bit strange. How come Nature does not make aesthetic mistakes?
Could beauty simply be a measure NATURAL-ness? Is it possible that we are psychologically programmed to read all things in Nature as 'beautiful'? If this is the case, perhaps we should have also been programmed with a greater respect for the survival of such beauty.