Fin - Ornamentation

Ornamentation

In biology, fins can have an adaptive significance as sexual ornaments. During courtship, the female cichlid, Pelvicachromis taeniatus, displays a large and visually arresting purple pelvic fin. "The researchers found that males clearly preferred females with a larger pelvic fin and that pelvic fins grew in a more disproportionate way than other fins on female fish."

The huge theropod dinosaur Spinosaurus may have used its sail or dorsal fin to regulate its temperature, or as a courtship display. Car tail fins in the 1950s were largely decorative Subsequently car fins evolved into highly functional spoilers and wings