One of the beautiful examples of symmetry in nature is the bilateral symmetry seen in animals. In this type of symmetry, if a central line is drawn, the animal can be divided into two matching halves. Humans also exhibit bilateral symmetry, and according to the some scientists, the level of symmetry determines how much of physical appeal they have. The more asymmetrical your face is, the less attractive you appear to people. And the most handsome man must have a perfect symmetry.
The peacock is one example of a beautiful bird with an attractive symmetrical tail which Darwin even praised.