How do peacock tail feathers and moose antlers function as male secondary sexual characteristics?

Peacock tail feathers and moose antlers are classic examples of secondary sexual characteristics that evolved through sexual selection. Rather than aiding in survival, these traits function to increase a male's success in securing mates.12

These characteristics operate through two primary mechanisms:

• Female Preference: The elaborate, fan-like tail feathers of the male peacock serve as a form of "sex appeal." Females often exhibit a preference for males displaying such conspicuous ornamentation, which signals fitness and attracts potential mates.13
• Male Competition: Antlers on a moose or stag function as weapons in contests of strength. Males use these structures to compete against other males for dominance. Winning these physical confrontations allows the successful male to secure more female mates, thereby passing on his genes.13

While these traits are often cumbersome and increase visibility to predators, their role in reproduction provides a competitive advantage that outweighs the associated survival risks.12