>>5025838 (OP)
Can't prove it, but I think that beauty (in an objective way with this thing of symmetrical and proportional features) is related to health. Then, in the aminal kingdom the tendency is that the healthiest animals survive in their environment, i.e. the most "beautiful" hence the "ugly" die because their unhealthy genes tend to make them deficient at their duty (the congenital unhealthy animals are weak, slow, etc.)
So the "ugly" predators or prey can't even pass on their genes thanks to Mother Nature.
But in an artificial environment were the nature cannot have much power we have this "ugly" aminals like pugs or bulldogs (that of course have many sickly conditions) and this also happen in zoo's therefore we can see "ugly" predators like that retarded tiger.
Finally, my idea is general; clearly there are exceptions to that objective definition of beauty, like those asymmetrical animals that can survive because of those asymmetrical features, but there are few examples of that kind of aminals.
So, if someone can put that photo of the autistic golden tigress to prove my point, I would be grateful (in a subjective way, I think that an autistic tiger is cute and beautiful).