The answer is: evolution for beautiful and beautiful sexual selection.
According to the traditional scientific view, the characteristics that animals show off in mate selection are "advertisements" that show their genetic advantages or quality advantages. Darwin clearly put forward the concept of aesthetics, which is considered to be the sexual choice of animals based on mate preference in order to adapt to the environment. He believes that the evolution of natural beauty is because animals have evolved into what they think is beautiful. Generally speaking, it is to position female organisms as promoters of species evolution. Natural selection reflects the influence of external forces of nature on organisms, such as competition, predation, climate and geographical conditions, while sexual selection is a potentially independent process, dominated by organisms themselves (mainly females). Female creatures have "beautiful taste" and "aesthetic ability", which leads male creatures to try to "seduce" their spouses in order to win the competition, thus evolving into more beautiful.
Second, why are humans just the opposite?
Because of the appearance of money, the aesthetic evolution of human beings has been reversed.
For men, being strong, healthy, shiny and strong is beauty, which is the charm that men attract women. Male pride is like peacock, male oriole sings with wings, and male red-crowned crane's space dance steps are used to attract and seduce females. However, the emergence of civilization and money has greatly changed the rules of the game and destroyed the evolution of human aesthetics. The main criteria for attracting the opposite sex are no longer men's beauty and strength, but money and status. Men no longer pursue beautiful and strong bodies, gorgeous clothes and exquisite hair accessories. They all focus on fame and fortune. On the other hand, women, in order to please men, began to make up and face up, and thus evolved more and more beautiful.
I wonder if men will evolve into ugly people and women will evolve into beautiful women? Looking forward to this day.