Ah, I see you went back to the topic.
I would like to blurt out something about symmetry, the mention serves as a trigger.
Symmetry is a practical measurement of over-all stability and resistance, as it shows how well any given individual withstood the "biological noise" and other interferences during fetal development. These interferences are to a wide extent unavoidable (wide, not absolute), thus it is often interpreted as "strenght" rather than "luck". And yes, I know that there is no conscious evaluation of all this in the sexual selection, it is simply easier for me to express it as if there were.
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I can make a statement true by placing it first in this signature.
"Everyone loves the dolphin. A bitter shark - emerging from it's cold depths - doesn't stand a chance." This is hyperbol.
"Run, Jump, Fall, Limp off, Try Harder."